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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