Table 1

Prevalence of mental problems according to the General Health Questionnaire in relation to sociodemographic characteristics in the first and second Dutch National Survey of General Practice.

	DNSGP1			DNSGP2
	n	% GHQ≥2	OR	n	% GHQ≥2	OR
Total	8924	16.8		9687	22.8

Sex:
Male (reference)	4354	13.5	1.00	4317	19.2	1.00
Female	4570	20.0	1.54^a	5369	25.7	1.40^a

Age (years):
18–24 (reference)	1237	17.5	1.00	739	25.0	1.00
25–44	4059	17.7	1.05	3424	25.6	1.22
45–64	2407	15.9	0.90	3534	22.0	1.00
65–74	833	14.2	0.67^a	1142	16.6	0.61^a
≤75	388	16.6	0.70^a	845	21.1	0.70^b

Education:
Primary	2411	17.5	0.93	1434	25.2	1.34^b
Lower	3711	15.4	0.74^a	3259	22.3	1.01
Secondary	1798	16.5	0.79^b	2931	21.1	0.87
Higher (reference)	1004	19.3	1.00	2056	23.5	1.00

Marital status:
Married (reference)	5335	15.0	1.00	6403	20.0	1.00
Unmarried	2891	17.9	1.22^b	2040	27.7	1.50^a
Divorced	256	29.4	2.31^b	496	34.5	2.02^a
Widowed	442	21.1	1.71^b	745	25.8	1.58^a

↵a P < 0.005.
↵b P < 0.05. DNSGP1 = First Dutch National Survey of General Practice. DNSGP2 = Second Dutch National Survey of General Practice. GHQ = General Health Questionnaire. OR = odds ratio.