Background: The early detection of moral distress requires a validated and reliable instrument. The aim of this study was to carry out an advanced analysis of the psychometric properties of the moral distress scale for health professionals (MMD-HP-SPA) by performing a validation of the construct and its internal and external reliability.
Methods: We performed a multicentre cross-sectional study in health professionals belonging to the Andalusian public health system. Construct validity was performed by exploratory (n = 300) and confirmatory (n = 275) factor analysis (EFA/CFA) in different subgroups; we also analysed the internal consistency and temporal reliability of the scale.
Results: 384 doctors and 191 nurses took part in the survey. The overall mean for moral distress was 128.5 (SD = 70.9), 95% CI [122.7-134.3], and it was higher in nurses at 140.5 (SD = 74.9) than in doctors at 122.5 (SD = 68.1), F = 8.37 p < 0.01. The EFA produced a model of five components which accounted for 54.8% of the variance of the model. The CFA achieved a goodness of fit of Chi2 = 972.4; AIC = 1144.3; RMSEA = 0.086; CFI = 0.844; TLI = 0.828; NFI = 0.785.
Conclusions: The MMD-HP-SPA scale has solid construct validity, excellent internal consistency, optimal temporal reliability, and underlying dimensions which effectively explore the causes of moral distress in health professionals, thus guaranteeing its use in hospital and community settings.
Keywords: health personnel; moral distress; psychometrics; stress psychological.