Table 2.

Sociodemographic factors associated with respondents (women, n=2595; men, n=1477) compared with non-respondents (women, n=7140; men, n=8788); crude and adjusted OR with 95% CIs

	Women				Men
	Crude OR	95% CI	Adj. OR*	95% CI	Crude OR	95% CI	Adj. OR*	95% CI
Age group
15–18 years	Ref		Ref		Ref		Ref
19–24 years	0.61	(0.55 to 0.69)	0.61	(0.50 to 0.74)	0.63	(0.55 to 0.72)	0.70	(0.56 to 0.89)
25–29 years	0.58	(0.52 to 0.66)	0.52	(0.42 to 0.65)	0.62	(0.54 to 0.71)	0.66	(0.50 to 0.87)
Ethnicity
Danish	Ref		Ref		Ref		Ref
Western immigrant	0.35	(0.26 to 0.46)	0.84	(0.45 to 1.56)	0.33	(0.22 to 0.50)	0.73	(0.37 to 1.43)
Non-Western immigrant	0.23	(0.19 to 0.27)	0.30	(0.23 to 0.39)	0.29	(0.22 to 0.38)	0.33	(0.24 to 0.45)
Education
Ongoing
≤10 years	Ref		Ref		Ref		Ref
11–15 years	0.75	(0.66 to 0.86)	1.10	(0.91 to 1.33)	0.69	(0.59 to 0.81)	0.90	(0.71 to 1.13)
>15 years	0.91	(0.79 to 1.05)	1.48	(1.16 to 1.89)	1.13	(0.95 to 1.35)	1.61	(1.19 to 2.17)
Highest completed
≤10 years	0.33	(0.27 to 0.41)	0.61	(0.47 to 0.80)	0.26	(0.20 to 0.33)	0.40	(0.29 to 0.56)
11–15 years	0.57	(0.49 to 0.67)	0.98	(0.77 to 1.26)	0.57	(0.48 to 0.68)	0.81	(0.60 to 1.10)
>15 years	1.05	(0.86 to 1.28)	1.89	(1.39 to 2.56)	0.98	(0.70 to 1.36)	1.38	(0.89 to 2.14)
Highest level of parents’ education
>15 years	Ref		Ref		Ref		Ref
11–15 years	0.67	(0.61 to 0.74)	0.74	(0.67 to 0.82)	0.66	(0.59 to 0.74)	0.78	(0.69 to 0.88)
≤10 years	0.36	(0.30 to 0.44)	0.50	(0.41 to 0.62)	0.35	(0.28 to 0.45)	0.55	(0.43 to 0.71)

Numbers in bold show a significantly increased or decreased OR for respondents compared with non-respondents.

*Adjusted for age group, ethnicity, educational level and highest achieved level of parents’ education.