Cunningham Nadia K, Brown Philippa M, Page Andrew C
School of Psychology, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Australia.
Mother and Baby Unit, King Edward Memorial Hospital, Subiaco, Western Australia, Australia.
Arch Womens Ment Health. 2015 Dec;18(6):793-804. doi: 10.1007/s00737-014-0485-9. Epub 2014 Dec 16.
The Edinburgh Postnatal Depression Scale is the most widely used measure for screening for depression in perinatal populations. A weakness is that the factor structure of the scale is inconsistent across studies. It is unclear the degree to which this inconsistency results from variability arising from the Edinburgh Postnatal Depression Scale (EPDS). The present study aimed to determine whether the EPDS factor structure remained stable in the same individuals reporting on their levels of distress across two testing occasions. Data were analysed for 636 postpartum inpatient females who were administered the EPDS at admission and discharge from a psychiatric mother and baby unit. Exploratory factor analyses (EFAs) and confirmatory factor analyses (CFAs) were conducted separately on the admission and discharge data to determine the optimal factor structure at each time point. The EFAs and CFAs supported a two-factor model at admission and a three-factor model at discharge. Given that the EPDS did not demonstrate an invariant number of factors, no further tests of measurement invariance were conducted. The EPDS does not appear to be invariant from admission to discharge. These findings suggest that individuals may respond differently to items depending on their level of distress. Potential implications for the EPDS in terms of comparability of scores across groups/time and its screening abilities are discussed.
爱丁堡产后抑郁量表是围产期人群中筛查抑郁症使用最广泛的测量工具。其一个不足之处在于，该量表的因子结构在不同研究中并不一致。目前尚不清楚这种不一致在多大程度上是由爱丁堡产后抑郁量表（EPDS）本身的变异性导致的。本研究旨在确定在两次测试中报告自身痛苦程度的同一批个体中，EPDS的因子结构是否保持稳定。对636名产后住院女性的数据进行了分析，这些女性在一家母婴精神病科病房入院和出院时均接受了EPDS测试。分别对入院和出院数据进行探索性因子分析（EFA）和验证性因子分析（CFA），以确定每个时间点的最佳因子结构。EFA和CFA结果显示，入院时支持两因子模型，出院时支持三因子模型。鉴于EPDS并未表现出因子数量的不变性，因此未进一步进行测量不变性检验。从入院到出院，EPDS似乎并非不变。这些发现表明，个体可能会根据自身痛苦程度对量表项目做出不同反应。文中还讨论了EPDS在跨组/跨时间分数可比性及其筛查能力方面的潜在影响。
