Table 2 Reliability (alpha), network centrality, factor adjustment (factor loading and thresholds) and difficulty parameter of Kessler's items

 Q1. ... about how often did you feel tired out for no good reason?

1.82

0.89

 Q4. ... about how often did you feel hopeless?*

2.03

0.89

0.78

 Q7. ... about how often did you feel depressed?

2.18

0.88

 Q8. ... about how often did you feel that everything was an effort?*

1.64

0.90

0.81

 Q9. ... about how often did you feel so sad that nothing could cheer you up?*

1.93

0.89

0.77

 Q10. ... about how often did you feel worthless?*

2.22

0.89

0.77

 Q2. ... about how often did you feel nervous?*

1.92

0.88

0.76

 Q3. ... about how often did you feel so nervous that nothing could calm you down?

2.12

0.87

 Q5. ... about how often did you feel restless or fidgety?*

2.18

0.88

0.77

 Q6. ... about how often did you feel so restless you could not sit still?

2.12

0.89

Overall

0.88(0.86;0.90)

0.78(0.74;0.82)