Objective To validate the psychometric characteristics of the Ford Insomnia Response to Stress Test—Chinese version(FIRST-C)in patients with short-term insomnia disorder(STID).Methods One hundred and seventy-two STID patients were recruited as the STID group from the outpatient clinic of Nanfang Hospital,Southern Medical University between November 2017 and June 2019,and 150 good-sleeper controls(GSC)were selected as the GSC group.The patients were evaluated using FIRST-C,Insomnia Severity Index(ISI),Epworth Sleepiness Scale(ESS),and the Hospital Anxiety and Depression Scale(HADS).Among them,72 STID patients underwent retesting after 3 months.Results The total scores of FIRST-C in the STID group were significantly higher than those in the GSC group(P＜0.05).Exploratory factor analysis revealed that FIRST-C exhibited a single-factor structure,explaining 51.04％of the vari-ance,with item factor loadings ranging from 0.405 to 0.828.The FIRST-C scores in the STID group showed a mod-erate possitive correlation with ESS(r,=0.498,P＜0.001),a mild correlation with HADS score(rs=0.174,P=0.024)and non-significant correlation with ISI score(rs=0.001,P=0.995).The receiver operating characteristic(ROC)curve analysis revealed an optimum cut-off score of 19.5 points for FIRST-C identifying STID and GSC.Reliability analysis indicated that Cronbach's α coefficient was 0.873 and Spearman-Brown split-half reliability was 0.864,with item and total score correlation coefficient ranging from 0.326 to 0.752.Moreover,there was statistically significant difference between the total scores of FIRST-C at the 3-month retest and those at the initial test(t=5.440,P＜0.001).Conclusion The FIRST-C demonstrates better psychometric characteristics for assessing sleep reactivity in patients with STID.
The Ford Insomnia Response to Stress TestShort-term insomnia disorderValidityReli-ability
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