Table 1 Demographic and clinical characteristics

Age, years

49.5 ± 9.7

Sex, male/female

29/113

Education attainment, years

10.7 ± 3.2

Marital status

 Never married

24 (16.9)

 Married/cohabiting

85 (59.9)

 Divorced/widowed

33 (23.2)

Occupation

 Professional and associate professional

6 (4.2)

 Skilled and semi-skilled worker

20 (14.1)

 Unskilled worker

16 (11.3)

 Retired

24 (16.9)

 Unemployed/housework

76 (53.5)

 Chronic medical illnesses^b

34 (23.9)

 Insomnia duration, years

10.3 ± 9.5

 Depression duration, years

8.6 ± 11.6

 Insomnia severity index score

19.9 ± 3.2

 Hamilton depression rating scale-17 item total score

10.5 ± 4.2