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Table 4 Comparison of factor models (A = three-factor, B = two-factor, C = one-factor) at T1–T4

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

Model N χ 2 df p CFI RMSEA 90 % CI for RMSEA Range of factor loadings Comparison χ2 ∆df p
T1 A 929 242.13 116 <0.001 .97 .03 .03–.04 .39–.85     
  B 929 316.70 118 <0.001 .95 .04 .04–.05 .39–.82 A vs. B 48.36 2 <0.001
  C 929 427.24 119 <0.001 .92 .05 .05–.06 .33–.81 B vs. C 62.14 1 <0.001
T2 A 929 239.75 116 <0.001 .98 .03 .03–.04 .42–.90     
  B 929 363.63 118 <0.001 .95 .05 .04–.05 .41–.87 A vs. B 53.43 2 <0.001
  C 929 491.39 119 <0.001 .93 .06 .05–.06 .42–.86 B vs. C 59.28 1 <0.001
T3 A 921 335.01 116 <0.001 .99 .05 .04–.05 .45–.97     
  B 921 491.34 118 <0.001 .98 .06 .05–.06 .45–.98 A vs. B 71.88 2 <0.001
  C 921 635.43 119 <0.001 .98 .07 .06–.07 .39–.98 B vs. C 59.04 1 <0.001
T4 A 929 439.58 116 <0.001 .97 .06 .05–.06 .48–.92     
  B 929 485.53 118 <0.001 .97 .06 .05–.06 .48–.91 A vs. B 29.99 2 <0.001
  C 929 666.37 119 <0.001 .95 .07 .07–.08 .42–.90 B vs. C 84.05 1 <0.001
  1. Note: A = the factors of anxiety symptoms, depressive symptoms, and FSS; B = the factors of internalised mental health and FSS; C = the factor of extended internalised mental health