Table 1

Prevalence of C trachomatis infection and risk factors among participants sexually active in the previous six months in a screening programme

	n	N	%	Univariable			Multivariable
	n	N	%	OR	95% CI	p LR	OR	95% CI	p LR
*AAD 1, very high urban (>2500 addresses/km²); AAD 2, high urban (1500–2500 addresses/km²); AAD 3, moderate urban (1000–1500 addresses/km²); AAD 4, low urban (500–1000 addresses/km²); AAD 5, rural (<500 addresses/km²).
†Low: primary school, lower vocational, or lower general secondary education; intermediate: intermediate vocational education, intermediate, or higher general secondary education; high: higher vocational education or university education.
Sex
Men	39	1999	2.0	1.0
Women	114	4304	2.6	1.4	0.9–2.0	0.088		–
Age group (years)						0.030			0.084
15–19	45	1440	3.1	1.2	0.8–1.8		1.4	0.9–2.1
20–24	43	2359	1.8	0.7	0.5–1.0		0.8	0.5–1.2
25–29	65	2504	2.6	1.0			1.0
AAD*						<0.001			<0.001
Very high urban (AAD 1)	57	1344	4.2	5.8	3.0–11.1		3.9	1.9–7.7
Low/moderate/high urban (AAD 2–4)	85	3507	2.4	3.3	1.7–6.1		2.6	1.4–4.9
Rural (AAD 5)	11	1452	0.8	1.0			1.0
Ethnicity						<0.001			0.005
Dutch	125	5802	2.2	1.0			1.0
Surinamese/Antillian	15	116	12.9	6.7	3.8–11.9		3.2	1.7–6.2
Other	12	370	3.2	1.5	0.8–2.8		1.0	0.5–1.9
Education†						<0.001			<0.001
Low	55	1508	3.6	2.8	1.8–4.4		3.0	1.8–4.9
Intermediate	66	2567	2.6	1.9	1.2–3.0		2.2	1.4–3.6
High	29	2151	1.3	1.0			1.0
Women’s complaints, previous 4 weeks
(Post)coital bleeding						0.004			0.053
Yes	12	184	6.5	2.7	1.5–5.1		2.0	1.0–4.0
No	102	4120	2.5	1.0			1.0
Intermenstrual bleeding						0.002
Yes	18	321	5.6	2.4	1.4–4.0
No	96	3983	2.4	1.0
Abnormal vaginal discharge						0.025
Yes	29	741	3.9	1.7	1.1–2.6
No	85	3563	2.4	1.0
Painful urination						0.228
Yes	14	385	3.6	1.4	0.8–2.5
No	100	3919	2.6	1.0
Frequent urination						0.014
Yes	21	465	4.5	1.9	1.2–3.1
No	93	3839	2.4	1.0
Lower abdominal pain						0.025
Yes	29	741	3.9	1.7	1.1–2.6
No	85	3563	2.4	1.0
Men’s complaints, previous 4 weeks
Frequent urination						0.016			0.051
Yes	6	102	5.9	3.5	1.4–8.6		2.8	1.1–7.2
No	33	1897	1.7	1.0			1.0
Painful urination						0.060
Yes	4	71	5.6	3.2	1.1–9.3
No	35	1928	1.8	1.0
Urethral discharge						0.103
Yes	2	26	7.7	4.4	1.0–19.1
No	37	1973	1.9	1.0
Age at first sex (years)						<0.001
⩽15	61	1413	4.3	3.0	2.0–4.6
16–17	57	2433	2.3	1.6	1.0–2.5
⩾18	32	2315	1.4	1.0
Lifetime partners (women)						<0.001			<0.001
1	8	1633	0.5	1.0			1.0
2–5	55	2045	2.7	5.6	2.7–11.8		4.6	2.4–8.9
⩾6	49	597	8.2	18.2	8.5–38.6		13.5	6.8–27.1
Lifetime partners (men)						<0.001			<0.001
1	4	567	0.7	1.0			1.0
2–5	13	919	1.4	2.0	0.7–6.2		2.6	1.1–5.9
⩾6	20	491	4.1	6.0	2.0–17.6		5.3	2.4–11.7
Partners in previous 6 months						<0.001
1	103	5509	1.9	1.0
2–5	43	717	6.0	3.3	2.3–4.8
⩾6	7	77	9.1	5.2	2.4–11.7
Sexual preference						0.194
Heterosexual	148	6179	2.4	1.0
Homo/bisexual	5	110	4.5	1.9	0.8–4.8
New contact in previous 2 months						<0.001			0.004
Yes	47	765	6.1	3.3	2.3–4.8		1.9	1.2–2.8
No	106	5515	1.9	1.0			1.0
Condom use at last sexual contact						0.204			0.029
Yes	26	1330	2.0	1.0			1.0
No	126	4954	2.5	1.3	0.9–2.0		1.6	1.0–2.6
Contraception at last sexual contact						0.169
Yes	124	5312	2.3	1.0
No	28	895	3.1	1.4	0.9–2.0
History of self reported STI						0.005
Yes	18	371	4.9	2.2	1.3–3.7
No	132	5894	2.2	1.0