Abstracts

Introduction

Experiences related to childbirth directly interfere with the health and well-being of the mother and her newborn, as well as with the choice of a future delivery ¹1. Ministério da Saúde. Humanização do parto e do nascimento. Brasília: Ministério da Saúde; 2014.^,22. Pang MW, Leung TN, Lau TK, Hang Chung TK. Impact of first childbirth on changes in women's preference for mode of delivery: follow-up of a longitudinal observational study. Birth 2008; 35:121-8.. Women who are satisfied with childbirth have fewer difficulties in caring for the newborn, tend to breastfeed their babies for longer and adapt more easily to the new functions of motherhood ³3. Pérez D'Gregorio R. Obstetric violence: a new legal term introduced in Venezuela. Int J Gynaecol Obstet 2010; 111:201-2.^,44. Jolivet R. Respectful maternity care: the universal rights of childbearing women. Washington DC: White Ribbon Alliance; 2011.^,55. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.. Dissatisfaction with childbirth increases the risk of negative health outcomes, such as postpartum depression and fear of giving birth again, which may lead to a preference for cesarean birth in future pregnancies and cause impacts on reproduction ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.^,66. Gottvall K, Waldenstrom U. Does a traumatic birth experience have an impact on future reproduction? BJOG 2002; 109:254-60..

The concept of satisfaction is complex and there is no consensus regarding its definition ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.^,77. Bleich SN, Özaltin E, Murray CJL. How does satisfaction with health-care system relate to patient expirience? Bull World Health Organ 2009; 87:271-8.. Patient satisfaction has been defined as the degree of quality attributed to a health service or product by an individual or whether its delivery was regarded as useful, effective, or beneficial ⁸8. Vaitsman J, Andrade GRB. Satisfação e responsividade: formas de medir a qualidade e a humanização da assistência à saúde. Ciênc Saúde Colet 2005; 10:599-613.. From this perspective, satisfaction with delivery expresses the user’s assessment of the care received ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.^,99. Nilvér H, Begley C, Berg M. Measuring women's childbirth experiences: a systematic review for identification and analysis of validated instruments. BMC Pregnancy Childbirth 2017; 17:203.^,1010. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68..

The evaluation of the birth satisfaction of women has become an object of interest to health managers and professionals in Brazil ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68.. One of the specific objectives of the National Health Services Evaluation is to assess the patients’ satisfaction with the Brazilian Unified National Health System (SUS) in specialized healthcare centers, outpatient clinics and hospitals of the Ministry of Health ¹¹11. Ministério da Saúde. PNASS: Programa Nacional de Avaliação de Serviços de Saúde. Brasília: Ministério da Saúde; 2015.. Despite this, the Rede Cegonha strategy for the Humanization of Prenatal, Childbirth and Pregnancy Care proposes service evaluation indicators that do not include patient satisfaction ¹²12. Ministério da Saúde. Portaria nº 1.459, de 24 de junho de 2011. Institui, no âmbito do Sistema Único de Saúde - SUS - a Rede Cegonha. Diário Oficial da União 2011; 27 jun..

To assess the birth satisfaction of women, it is necessary to use instruments that are easy to apply and that have good psychometric proprieties ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.^,99. Nilvér H, Begley C, Berg M. Measuring women's childbirth experiences: a systematic review for identification and analysis of validated instruments. BMC Pregnancy Childbirth 2017; 17:203.^,1313. Perriman N, Davis D. Measuring maternal satisfaction with maternity care: a systematic integrative review: what is the most appropriate, reliable and valid tool that can be used to measure maternal satisfaction with continuity of maternity care? Women Birth 2016; 29:293-9.^,1414. American Educational Research Association; American Psychological Association; National Council on Measurement in Education. Standards for educational and psychological testing. Washington DC: American Educational Research Association; 2014.. Two systematic reviews analyzing instruments that measure birth satisfaction concluded that most of them were inadequate for their purposes ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.^,99. Nilvér H, Begley C, Berg M. Measuring women's childbirth experiences: a systematic review for identification and analysis of validated instruments. BMC Pregnancy Childbirth 2017; 17:203.. Some instruments were used before having been tested for their psychometric properties ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.. Only the Maternal Satisfaction Scale for Caesarean Section developed in Canada was evaluated in the two reviews ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.^,99. Nilvér H, Begley C, Berg M. Measuring women's childbirth experiences: a systematic review for identification and analysis of validated instruments. BMC Pregnancy Childbirth 2017; 17:203.. The 2013 review evaluated nine instruments and concluded that a few of them had evidence of validity and reliability ⁵5. Sawyer A, Ayers S, Abbott J, Gyte G, Rabe H, Duley L. Measures of satisfaction with care during labour and birth: a comparative review. BMC Pregnancy Childbirth 2013; 13:108.. The most recent review analyzed 36 instruments and concluded that only seven had been assessed in relation to their psychometric proprieties. In this review, the authors point out that these instruments have a wide variety of purposes, number of scale items, dimensions, contents evaluated and periods of applicability, and this diversity compromises their reproducibility ⁹9. Nilvér H, Begley C, Berg M. Measuring women's childbirth experiences: a systematic review for identification and analysis of validated instruments. BMC Pregnancy Childbirth 2017; 17:203..

In Brazil, two studies that evaluated birth satisfaction were identified ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68.^,1515. Freire HSS, Campos FC, Castro RCMB, Costa CC, Mesquita VJ, Viana RAA. Normal birth assisted by nurse: experience and satisfaction of puerperals. J Nurs UFPE on line 2017; 11:2357-67.. The first one used a six-dimensional scale developed by the study team, but no evidence of reliability and validity was presented. The authors used only the chi-square test in the analyses and concluded that 67% of those interviewed were satisfied with the delivery process ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68.. In 2015, evidence of validity of subscales 2 and 3 of the Childhood Experience and Satisfaction Questionnaire (QESP in the Portuguese acronym) were investigated in a sample of 237 mothers submitted to vaginal birth in a teaching maternity hospital in the city of Fortaleza (Ceará State). The authors also concluded that QESP had high reliability according to Cronbach’s alpha ¹⁵15. Freire HSS, Campos FC, Castro RCMB, Costa CC, Mesquita VJ, Viana RAA. Normal birth assisted by nurse: experience and satisfaction of puerperals. J Nurs UFPE on line 2017; 11:2357-67.. QESP was developed in Portugal and showed some evidence of good psychometric proprieties in a sample of 306 women. The subscales evaluate positive and negative experiences with vaginal birth ¹⁶16. Costa R, Figueiredo B, Pacheco A, Marques A, Pais A. Questionário de experiência e satisfação com o parto (QUESP). Psicol Saúde Doenças 2004; 5:159-87..

The Birth in Brazil survey used a scale to measure women’s satisfaction with the childbirth care received at the hospital ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68.. This instrument was adapted from questions that measured the user’s satisfaction with general health care of the World Health Survey (WHS) ¹⁷17. World Health Organization. World Health Survey: B - individual questionnaire, rotation - C. Geneva: World Health Organization; 2002., plus three specific questions regarding overall satisfaction with delivery, postpartum and neonatal care and one question about institutional violence (physical, psychological or verbal) ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68..

The women’s birth satisfaction was positively associated with age, number of children, education level and income ¹⁸18. Al Ahmar E, Tarraf S. Assessment of the socio-demographic factors associated with the satisfaction related to the childbirth experience. Open J Obstet Gynecol 2014; 4:585-611.. Those who had more personal control during childbirth ¹⁹19. Goodman P, Mackey MC, Tavakoli AS. Factors related to childbirth satisfaction. J Adv Nurs 2004; 46:212-9., more social support ²⁰20. Waldenström U, Hildingsson I, Rubertsson C, Rådestad I. A negative birth experience: prevalence and risk factors in a national sample. Birth 2004; 31:17-27., medical problems during labor ²⁰20. Waldenström U, Hildingsson I, Rubertsson C, Rådestad I. A negative birth experience: prevalence and risk factors in a national sample. Birth 2004; 31:17-27. and low labor pain ¹⁹19. Goodman P, Mackey MC, Tavakoli AS. Factors related to childbirth satisfaction. J Adv Nurs 2004; 46:212-9. showed higher birth satisfaction levels.

Thus, the objective of this study was to evaluate the hospital birth satisfaction scale’s psychometric properties: internal consistency, association with external variables, and configural and metric invariance.

Methods

Type of study

This is a cross-sectional study with data from the first follow-up interview of the national survey on childbirth and birth in Brazil: Birth in Brazil.

Birth in Brazil was a hospital-based population survey aimed at understanding the determinants, the magnitude, and the adverse effects of unnecessary cesarean sections in Brazil. At the baseline, carried out from February 2011 to October 2012, postpartum women were interviewed during their hospital admission and data was extracted from their medical records. In the first follow-up, conducted from March 2011 to February 2013, the participants were contacted by telephone up to six months after delivery ²¹21. Leal MC, Silva AAM, Dias MAB, Gama SGN, Rattner D, Moreira ME, et al. Birth in Brazil: national survey into labour and birth. Reprod Health 2012; 9:15..

Sample and data collection

In the Birth in Brazil survey, three-stage cluster sampling was performed with previous stratification according to the five regions of the country, the location (capital or non-capital) and the type of hospital (public, mixed or private). In the first stage, hospitals with 500 or more births per year were selected; in the second stage, the number of days the staff would be in the hospitals to collect data from the medical records was defined (at least seven days in each hospital); and in the third stage, the number of researchers per hospital and number of shifts and interviews per day was established to ensure the random selection of participants. A total of about 90 mothers who had recently given birth were selected to be interviewed in each of the 266 hospitals, totaling 24,200 newborns. After excluding women whose satisfaction data was not found (n = 64), as well as the 2nd and 3rd products of multiple gestations (n = 244), the sample size totaled 23,892 women. Details of the sampling design have been published previously ²²22. Vasconcellos MTL, Silva PLN, Pereira APE, Schilithz AOC, Souza Junior PRB, Szwarcwald CL. Desenho da amostra Nascer no Brasil: Pesquisa Nacional sobre Parto e Nascimento. Cad Saúde Pública 2014; 30 Suppl:S49-58..

The postpartum interviews were conducted by telephone up to six months after hospital discharge. A total of 16,255 women were located and interviewed in the follow-up. After excluding the 2nd and 3rd products of multiple gestations (n = 146), the sample size for analysis totaled 16,109 women, corresponding to 67.4% of the initial sample. Detailed information on data collection has been described previously ²¹21. Leal MC, Silva AAM, Dias MAB, Gama SGN, Rattner D, Moreira ME, et al. Birth in Brazil: national survey into labour and birth. Reprod Health 2012; 9:15..

All estimates were weighed while taking the complex sampling design and questions that had not been answered into account, using inverse probability weighting. The probability of participation in the second follow-up was estimated based on the three variables that composed the stratum (macro-region, capital or non-capital city and type of hospital), socioeconomic status, maternal age, maternal work, satisfaction with gestation at onset of pregnancy and infant death ²²22. Vasconcellos MTL, Silva PLN, Pereira APE, Schilithz AOC, Souza Junior PRB, Szwarcwald CL. Desenho da amostra Nascer no Brasil: Pesquisa Nacional sobre Parto e Nascimento. Cad Saúde Pública 2014; 30 Suppl:S49-58..

Instruments

The hospital birth satisfaction scale was part of Block III (Satisfaction with hospital care) of the Birth in Brazil survey’s follow-up questionnaire, in which there was an introductory text that reads: “We will now ask you some questions regarding your hospitalization for labor and your satisfaction with how it went”. The first seven questions were extracted and adapted from the WHS applied in Brazil (items 1 to 7) ¹⁷17. World Health Organization. World Health Survey: B - individual questionnaire, rotation - C. Geneva: World Health Organization; 2002.. Because satisfaction with hospital childbirth care involves aspects not covered by the nine questions of WHS’s satisfaction with general care instrument, three specific questions regarding overall satisfaction with delivery, postpartum and neonatal care were included (items 9 to 11) ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68.. Considering that violence is a component of satisfaction with hospital childbirth care, one question about institutional violence (physical, psychological or verbal) was also added to the scale (item 8) ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68..

For all questions, except question 8 on violence, there were five Likert response options (1. Very good; 2. Good; 3. Moderate; 4. Bad; 5. Very bad). All the items of the scale were reverse coded so that higher values expressed greater satisfaction with the care received. For question 8, there were four answer options, allowing the choice of more than one option if violence had occurred: 1. Did not suffer violence; 2. Suffered verbal violence; 3. Suffered psychological violence; and 4. Suffered physical violence. Since this variable is nominal, with more than two items, it was necessary to transform it into a dichotomous variable. In our analyses, we considered two responses for this item: 0 - There was no violence and 1 - There was violence in case of one or more positive answers for the occurrence of institutional violence ¹⁰10. d'Orsi E, Brüggemann OM, Diniz CSG, Aguiar JM, Gusman CR, Torres JA, et al. Desigualdades sociais e satisfação das mulheres com o atendimento ao parto no Brasil: estudo nacional de base hospitalar. Cad Saúde Pública 2014; 30 Suppl:S154-68..

External variables

The following variables from the Birth in Brazil survey were also used: type of delivery (vaginal or cesarean), type of insurance (public or private), presence of companion at some point during hospitalization for labor (yes/no) and the mother’s education level (0 to 4, 5 to 8, 9 to 11, ≥ 12 years of study).

Statistical analysis

A descriptive analysis was performed with the complete follow-up sample (n = 16,109) to calculate the frequency and proportion of the 11 items of the original scale proposed. The sample was then randomly divided into two parts for the analysis: first half (n = 8,055) and second half (n = 8,054). Scree-plot was applied to the first half in order to determine the number of factors. According to this method, the best number of factors corresponds to a change in the graph’s inclination (the “elbow” method) ²³23. Jolliffe IT. Principal component analysis. 2nd Ed. New York: Springer; 2002.. Afterwards, Exploratory Factor Analysis (EFA) was carried out to verify the model’s fit and factor loadings with the number of factors suggested by the scree plot, on the Mplus software version 7.31 (https://www.statmodel.com/). We used the weighted least squares means and variance (WLSMV) method ²⁴24. Byrne BM. Structural equation modeling with Mplus: basic concepts, applications, and programming. New York: Routledge; 2012., because all variables were ordinal.

In the EFA, model fit was assessed using the following indices: (a) value ≤ 0.06 for the Root Mean Square Error of Approximation (RMSEA) index ²⁵25. Browne MW, Cudeck R. Alternative ways of assessing model fit. Sociol Method Res 1992; 21:230-58.^,2626. Hu L, Bentler PM. Cutoff criteria for fit indexes in covariance structure analysis: conventional criteria versus new alternatives. Struct Equ Modeling 1999; 6:1-55.; (b) value ≥ 0.95 for the Comparative Mean Square (CFI) and the Tucker Lewis Index (TLI) ²⁶26. Hu L, Bentler PM. Cutoff criteria for fit indexes in covariance structure analysis: conventional criteria versus new alternatives. Struct Equ Modeling 1999; 6:1-55.; and (c) value ≤ 0.05 for the Standardized Root Mean Square Residual index (SRMR) ²⁴24. Byrne BM. Structural equation modeling with Mplus: basic concepts, applications, and programming. New York: Routledge; 2012.. Factor loadings were considered adequate if higher than 0.5 ²⁷27. Kline RB. Principles and practice of structural equation modeling. New York: The Guilford Press; 2016..

Then, Loevinger’s H coefficient (LH) was calculated for each of the scale’s items to verify if they measured the same latent characteristic, if there was redundancy of items and also, to validate the score as an ordinal measure of the latent characteristic (internal consistency). It was considered acceptable if LH > 0.30. Later, the relation between the latent trait and the answers to the items was tested according to Mokken’s criterion ²⁸28. Hardouin JB, Antignac AB, Sébille V. Nonparametric item response theory using Stata. Stata J 2011; 11:30-51.. The Stata 14.0 (https://www.stata.com) was used for these analyses.

Confirmatory Factor Analysis (CFA) was applied to the sample’s second half based on the dimensional structure proposed in the EFA. The RMSEA, CFI and TLI ²⁵25. Browne MW, Cudeck R. Alternative ways of assessing model fit. Sociol Method Res 1992; 21:230-58.^,2626. Hu L, Bentler PM. Cutoff criteria for fit indexes in covariance structure analysis: conventional criteria versus new alternatives. Struct Equ Modeling 1999; 6:1-55. indicators were used to assess the model’s fit. A factor loading > 0.5 with p-value < 0.05 was considered to indicate if the correlation between the indicator and the construct which it is supposed to measure was satisfactory ²⁷27. Kline RB. Principles and practice of structural equation modeling. New York: The Guilford Press; 2016..

Composite Reliability (CR) was calculated from the factor loadings obtained in the EFA and CFA. CR ≥ 0.70 was considered evidence of internal consistency ²⁹29. Fornell C, Larcker DF. Evaluating structural equation models with unobservable variables and measurement error. J Mark Res 1981; 18:39-50..

Configural (whether the same items measure satisfaction between groups - factor loading not constrained in any groups) and metric (in addition to satisfaction being measured by the same items, the factor loadings of these items are equivalent between groups - the constraining factor loadings are the same in all groups) invariances between type of hospital (private or public) and type of delivery (cesarean or vaginal) were tested. Chi-squared, chi-squared difference test, TLI, CFI and RMSEA were used to assess invariance ²⁴24. Byrne BM. Structural equation modeling with Mplus: basic concepts, applications, and programming. New York: Routledge; 2012.^,3030. Chen FF. Sensitivity of goodness of fit indexes to lack of measurement invariance. Struct Equ Modeling 2007; 14:464-504..

The relationships between satisfaction and hospital childbirth care and external variables “presence of companion at some point during hospitalization for labor”, “private insurance” and “mother’s education level” were evaluated by the standardized coefficient, and its significance value was estimated in a model that regressed each variable at a time.

Ethical aspects

The project complied with the principles of Resolution n. 196/96 for research involving human beings, of the Brazilian National Health Council and its complementary norms. It was submitted and approved by the Ethics Research Commitee of Sergio Arouca National School of Public Health, Oswaldo Cruz Foundation (ENSP/Fiocruz) under CAAE n. 0096.0.031.000-10. Those responsible for each institution and all the participants signed an informed consent form at the time of the in-person interview.

Results

The satisfaction of the women in the sample (n = 16,109) is described in Table 1. More than 75% of the survey’s respondents classified the time it took them to get to the maternity hospital, the time transpired since their arrival at the hospital until they were attended to, respect, privacy, clarity of explanations and possibility of discussing the birth process with the health professionals, as well as their overall satisfaction with the childbirth, postpartum and newborn care received, as “good” or “very good”. Approximately 95% of the women answered that they did not suffer maltreatment or any other kind of abuse/violence by the health professionals.

The scree plot suggested the proposed construct to be one-dimensional (Figure 1). The EFA showed a good fit of the one-dimensional model for all the indicators in the first half of the sample, with factor loadings higher than 0.5 for all items, except for the item that investigates the time taken to get to the maternity hospital (Table 2). A two-dimensional model was also tested and showed good fit.

LH coefficient showed value < 0.3 only for the first item, “When you were going to the hospital for labor, how would you score the amount of time it took you to get there?” (LH = 0.264) (Table 2). In the evaluation using Mokken’s criterion, this item was removed from the scale. The LH coefficient for the 10-item scale was 0.415.

CFA was applied to the sample’s second half, including the ten remaining items. All factor loadings were > 0.5 and all p-values were < 0.001 (Table 3). CR was 0.91.

Configural and metric invariance was obtained for both type of delivery and type of hospital (Table 4).

Birth satisfaction was associated with the mother’s education level (Standardized Coefficient - SC = 0.073; p = 0.035), private insurance (SC = 0.183; p < 0.001) and having a companion at some point during hospitalization for labor (SC = 0.193; p = 0.001).

Discussion

In the present study, the psychometric analysis showed that the hospital birth satisfaction scale is a unidimensional instrument composed of ten items. The unidimensionality suggested in the scree plot was initially tested in the EFA conducted with the sample’s first half. A good fit of this one-dimensional model was observed for eleven items, but with low factor loading for the first item: “When you were going to the hospital for labor, how would you score the amount of time it took you to get there?”. The scalability tests (LH coefficient and Mokken’s criterion) suggested the removal of this item.

The first item, “When you were going to the hospital for labor, how would you score the amount of time it took you to get there?”, refers to factors that are external to hospital childbirth care and was thus excluded by the scalability tests, suggesting that this item does not measure the desired latent trait. This exclusion showed that the instrument could discriminate situations occurring inside and outside the hospital setting. The instruments analyzed in three recent systematic reviews did not include questions about the amount of time spent to get to the maternity hospital ⁴4. Jolivet R. Respectful maternity care: the universal rights of childbearing women. Washington DC: White Ribbon Alliance; 2011.^,99. Nilvér H, Begley C, Berg M. Measuring women's childbirth experiences: a systematic review for identification and analysis of validated instruments. BMC Pregnancy Childbirth 2017; 17:203.^,1515. Freire HSS, Campos FC, Castro RCMB, Costa CC, Mesquita VJ, Viana RAA. Normal birth assisted by nurse: experience and satisfaction of puerperals. J Nurs UFPE on line 2017; 11:2357-67.. Furthermore, other two studies that evaluated different types of instruments do not mention or suggest that the time taken to get to the maternity hospital is related to satisfaction with childbirth care ²2. Pang MW, Leung TN, Lau TK, Hang Chung TK. Impact of first childbirth on changes in women's preference for mode of delivery: follow-up of a longitudinal observational study. Birth 2008; 35:121-8.^,88. Vaitsman J, Andrade GRB. Satisfação e responsividade: formas de medir a qualidade e a humanização da assistência à saúde. Ciênc Saúde Colet 2005; 10:599-613..

In the CFA, applied to the sample’s second half, the one-dimensional scale of ten items once again showed good fit for assessing satisfaction with hospital childbirth care, indicating that a single “satisfaction” dimension encompasses several aspects of childbirth care. The composite reliability results suggested that the construct had good internal consistency.

A two-dimensional model also showed good fit but no plausible theoretical justifications were found to explain the groupings of items in these models. Furthermore, since the one-dimensional model already showed good fit, we considered the one-factor model a more parsimonious description of our data.

Unidimensionality implies that the answers to all items are governed by a single latent trait. A practical advantage of this assumption is that it makes it easy to interpret the results. For a questionnaire with the objective of measuring several latent traits, this analysis must be performed for each one-dimensional latent characteristic ²⁸28. Hardouin JB, Antignac AB, Sébille V. Nonparametric item response theory using Stata. Stata J 2011; 11:30-51..

These results showed that the time spent waiting to receive care, respectful treatment and provision of guidance, participation of the users in the decisions about their labor process, absence of violence until delivery and the care received after childbirth, influenced the patients’ satisfaction. This indicates that satisfaction is a construct formed by several attributes.

There was evidence of both configural and metric invariance, indicating that the scale has the same structure and equal factor loadings between groups of vaginal and cesarean delivery, and between those with private and public insurance ³⁰30. Chen FF. Sensitivity of goodness of fit indexes to lack of measurement invariance. Struct Equ Modeling 2007; 14:464-504..

The associations between birth care satisfaction and external variables were as expected: the higher the mother’s education level, the higher their satisfaction. Also, satisfaction was higher for mothers with private insurance and for those who had a companion at some point during their hospitalization for labor.

This study contributes with evidence of the validity of a scale used in a country of continental dimensions such as Brazil, with EFA and CFA. Also, the sample was huge and population-based, and the women were chosen at random. In addition, the sample included women from different socioeconomic and cultural backgrounds, from both public and private hospitals, subjected to either vaginal birth or cesarean section. Another positive point was that the hospital birth satisfaction’s assessment was performed outside the institution and after a long time interval since birth, which makes the possibility of satisfaction being associated with gratitude unlikely.

One of the limitations is that there was a considerable percentage of losses (32.6%). Inverse probability weighing was used to minimize this limitation, taking questions that had not been answered into account. Recall bias may have also influenced the estimates, but a six-month period between childbirth and data collection is a short period of time, so any recall bias, if present, should have been small.

Conclusion

The hospital birth satisfaction scale is a one-dimensional instrument containing ten items, which evaluates the quality of the care received by women during labor, regardless of the type of birth or whether the facility was public or private. In addition, the associations between hospital birth satisfaction and external variables were as expected, showing evidence of its validity.

Acknowledgments

The researchers thank the interviewees, the managers and health workers of the maternity hospitals and the Birth in Brazil research team, as well as the Brazilian National Research Council (CNPq); the Ministry of Health; Oswaldo Cruz Foundation - INOVA Project and Rio de Janeiro State Research Foundation (FAPERJ) for their financial support.

References

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