Perceived Stress Scale: confirmatory factor analysis of the PSS14 and PSS10 versions in two samples of pregnant women from the BRISA cohort
Perceived Stress Scale: confirmatory factor analysis of the PSS14 and PSS10 versions in two samples of pregnant women from the BRISA cohort
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DOI：
10.1590/0102-311x00184615
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发表时间：
2017-12-01
期刊：
影响因子：
--
通讯作者：
Bettiol, Heloisa
中科院分区：
文献类型：
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作者：
Yokokura, Ana Valéria Carvalho Pires;Silva, Antônio Augusto Moura da;Bettiol, Heloisa
本研究旨在评估感知压力量表（PSS）的维度结构、可靠性、收敛有效性、判别有效性和可扩展性。样本包括巴西圣路易斯（马拉尼昂州）的 1,447 名孕妇和里贝朗普雷图（圣保罗州）的 1,400 名孕妇。量表的 14 项和 10 项版本通过验证性因素分析、加权最小二乘均值和方差 (WLSMV) 进行评估。在这两个城市，双因素模型（积极因素，衡量压力情况的恢复能力，消极因素，衡量压力情况）比单因素模型更适合。完整量表（PSS14）和缩减量表（PSS10）的双因素模型显示出良好的内部一致性（Cronbach's alpha >= 0.70）。除负维度的第 8 项和第 12 项以及正维度的第 13 项外，所有因子载荷均 >= 0.50。压力和心理暴力两个维度之间的相关性显示出预期的大小（0.46-0.59），提供了足够的收敛结构有效性的证据。量表的正向维度和负向维度之间的相关性在0.74-0.78左右，小于0.85，这表明有足够的判别效度。 PSS10 的提取平均方差和可扩展性略高于 PSS14。两个城市的结果是一致的。总之，不建议使用单因素解决方案来评估孕妇的压力。简化后的 10 项双因素量表似乎更适合测量孕妇的感知压力。
This study aimed to assess the dimensional structure, reliability, convergent validity, discriminant validity, and scalability of the Perceived Stress Scale (PSS). The sample consisted of 1,447 pregnant women in Sao Luis (Maranhao State) and 1,400 in Ribeirao Preto (Sao Paulo State), Brazil. The 14 and 10-item versions of the scale were assessed using confirmatory factor analysis, using weighted least squares means and variance (WLSMV). In both cities, the two-factor models (positive factors, measuring resilience to stressful situations, and negative factors, measuring stressful situations) showed better fit than the single-factor models. The two-factor models for the complete (PSS14) and reduced scale (PSS10) showed good internal consistency (Cronbach's alpha >= 0.70). All the factor loadings were >= 0.50, except for items 8 and 12 of the negative dimension and item 13 of the positive dimension. The correlations between both dimensions of stress and psychological violence showed the expected magnitude (0.46-0.59), providing evidence of an adequate convergent construct validity. The correlations between the scales' positive and negative dimensions were around 0.74-0.78, less than 0.85, which suggests adequate discriminant validity. Extracted mean variance and scalability were slightly higher for PSS10 than for PSS14. The results were consistent in both cities. In conclusion, the single-factor solution is not recommended for assessing stress in pregnant women. The reduced, 10-item two-factor scale appears to be more appropriate for measuring perceived stress in pregnant women.