Psychometric Evaluation of the Ford Insomnia Response to Stress Test (FIRST) in Early Pregnancy
Gelaye B, Zhong QY, Barrios YV, Redline S, Drake CL, and Williams MA. Psychometric evaluation of the ford insomnia response to stress test (FIRST) in early pregnancy. J Clin Sleep Med 2016; 12(4):579-587.
J Clin Sleep Med
STUDY OBJECTIVES: To evaluate the construct validity and factor structure of the Spanish-language version of the Ford Insomnia Response to Stress Test questionnaire (FIRST-S) when used in early pregnancy.
METHODS: A cohort of 647 women were interviewed at ≤ 16 weeks of gestation to collect information regarding lifestyle, demographic, and sleep characteristics. The factorial structure of the FIRST-S was tested through exploratory and confirmatory factor analyses (EFA and CFA). Internal consistency and construct validity were also assessed by evaluating the association between the FIRST-S with symptoms of depression, anxiety, and sleep quality. Item response theory (IRT) analyses were conducted to complement classical test theory (CTT) analytic approaches.
RESULTS: The mean score of the FIRST-S was 13.8 (range: 9-33). The results of the EFA showed that the FIRST-S contained a one-factor solution that accounted for 69.8% of the variance. The FIRST-S items showed good internal consistency (Cronbach α = 0.81). CFA results corroborated the one-factor structure finding from the EFA; and yielded measures indicating goodness of fit (comparative fit index of 0.902) and accuracy (root mean square error of approximation of 0.057). The FIRST-S had good construct validity as demonstrated by statistically significant associations of FIRST-S scores with sleep quality, antepartum depression and anxiety symptoms. Finally, results from IRT analyses suggested excellent item infit and outfit measures.
CONCLUSIONS: The FIRST-S was found to have good construct validity and internal consistency for assessing vulnerability to insomnia during early pregnancy.
Medical Subject Headings
Adolescent; Adult; Factor Analysis, Statistical; Female; Humans; Peru; Pregnancy; Pregnancy Complications; Pregnancy Trimester, First; Psychometrics; Reproducibility of Results; Sleep Initiation and Maintenance Disorders; Stress, Psychological; Surveys and Questionnaires; Translating; Young Adult