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Table 2 The fit indices of the measurement models and Cronbach’s alpha for each measure (anxiety symptoms, depressive symptoms, FSS, and GHQ) at each time point

From: Addressing challenges of validity and internal consistency of mental health measures in a 27- year longitudinal cohort study – the Northern Swedish Cohort study

Scale Wave N χ 2 Df P CFI RMSEA 90 % CI for RMSEA Range of factor loadings Cronbach’s alpha
Anxiety symptoms T1 928 18.45 5 .002 .99 .05 .03–.08 .62–.85 .72
T2 929 48.20 5 <0.001 .98 .10 .07–.12 .80–.91 .79
T3 914 22.42 5 <0.001 1.00 .06 .04–.09 .86–.98 .90
T4 929 51.46 5 <0.001 .99 .10 .08–.13 .82–.92 .86
Depressive symptoms T1 929 18.45 9 .030 .99 .03 .01–.06 .44–.80 .65
T2 929 5.78 9 .762 1.00 .00 .00–.03 .44–.74 .61
T3 921 19.66 9 .020 .99 .04 .01–.06 .55–.79 .67
T4 929 34.07 9 <0.001 .99 .06 .04–.08 .62–.89 .76
FSS T1 929 85.29 35 <0.001 .97 .04 .03–.05 .43–.67 .70
T2 929 111.67 35 <0.001 .95 .05 .04–.06 .47–.68 .70
T3 921 101.52 35 <0.001 .97 .05 .04–.06 .47–.75 .74
T4 929 154.35 35 <0.001 .96 .06 .05–.07 .48–.79 .79
GHQ6-n T1 926 165.42 9 <0.001 .97 .14 .12–.16 .64–.89 .81
T2 927 169.88 9 <0.001 .98 .14 .12–.16 .66–.95 .83
T3 916 180.78 9 <0.001 .99 .14 .13–.16 .62–.97 .84
T4 923 235.61 9 <0.001 .98 .17 .15–.18 .68–.96 .85
GHQ6-p T1 927 53.21 9 .000 .98 .07 .06–.09 .45–.76 .72
T2 927 56.44 9 .000 .98 .08 .06–.10 .45–.79 .72
T3 917 92.58 9 .000 .98 .10 .08–.12 .61–.85 .79
T4 926 155.40 9 .000 .96 .13 .12–.15 .58–.85 .80