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Validation of the German version of the Ford Insomnia Response to Stress Test
Author(s) -
Dieck Arne,
Helbig Susanne,
Drake Christopher L.,
Backhaus Jutta
Publication year - 2018
Publication title -
journal of sleep research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 117
eISSN - 1365-2869
pISSN - 0962-1105
DOI - 10.1111/jsr.12621
Subject(s) - insomnia , psychology , convergent validity , cronbach's alpha , discriminant validity , clinical psychology , test (biology) , construct validity , psychiatry , psychometrics , internal consistency , paleontology , biology
Summary The purpose of this study was to assess the psychometric properties of a German version of the Ford Insomnia Response to Stress Test with groups with and without sleep problems. Three studies were analysed. Data set 1 was based on an initial screening for a sleep training program ( n = 393), data set 2 was based on a study to test the test–retest reliability of the Ford Insomnia Response to Stress Test ( n = 284) and data set 3 was based on a study to examine the influence of competitive sport on sleep ( n = 37). Data sets 1 and 2 were used to test internal consistency, factor structure, convergent validity, discriminant validity and test–retest reliability of the Ford Insomnia Response to Stress Test. Content validity was tested using data set 3. Cronbach's alpha of the Ford Insomnia Response to Stress Test was good ( α = 0.80) and test–retest reliability was satisfactory ( r = 0.72). Overall, the one‐factor model showed the best fit. Furthermore, significant positive correlations between the Ford Insomnia Response to Stress Test and impaired sleep quality, depression and stress reactivity were in line with the expectations regarding the convergent validity. Subjects with sleep problems had significantly higher scores in the Ford Insomnia Response to Stress Test than subjects without sleep problems ( P < 0.01). Competitive athletes with higher scores in the Ford Insomnia Response to Stress Test had significantly lower sleep quality ( P = 0.01), demonstrating that vulnerability for stress‐induced sleep disturbances accompanies poorer sleep quality in stressful episodes. The findings show that the German version of the Ford Insomnia Response to Stress Test is a reliable and valid questionnaire to assess the vulnerability to stress‐induced sleep disturbances.