Table 2

Specific characteristics of participants and a subset of non-responders (non-response study)

	Participants			Non-responders			p Value*
	n	N	%	n	N	%	p Value*
Missing values reduce the denominator in several categories.
*χ² or Fischer’s exact test.
†Symptoms in men: pain in passing urine, more frequent urination and/or penile discharge. Symptoms in women: intermenstrual or postcoital bleeding, abnormal vaginal discharge, pain in passing urine, frequent urination and/or lower abdominal pain.
‡Only if sexually active (ever).
¶Only if sexually active in the past 6 months.
Ethnicity							0.11
Dutch	7516	8181	92%	218	230	95%
Non Dutch	665	8181	8%	12	230	5%
Education							<0.001
Low	2093	8073	26%	51	232	22%
Intermediate	3394	8073	42%	131	232	56%
High	2586	8073	32%	50	232	22%
Symptoms†
Yes (men)	218	2918	8%	3	117	3%	0.05
Yes (women)	1978	5421	37%	17	121	14%	<0.001
Total	2196	8339	26%	20	238	8%	<0.001
Ever had sex
Yes (men)	2317	2842	82%	78	103	76%	0.14
Yes (women)	4688	5342	88%	79	99	80%	0.02
Total	7005	8184	86%	157	202	78%	0.002
Number lifetime partners‡							0.45
1	2545	6945	37%	56	155	36%
2–5	3257	6945	47%	72	155	46%
⩾6	1143	6945	16%	27	155	17%
Sex in the past 6 months‡
Yes (men)	1999	2308	87%	62	74	84%	0.48
Yes (women)	4304	4677	92%	61	70	87%	0.14
Total	6303	6985	91%	123	144	85%	0.06
New partner last 2 months¶	765	6280	12%	13	115	11%	0.78
Condom used last contact¶
Yes (men)	565	1993	28%	19	61	31%	0.63
Yes (women)	765	4291	18%	17	60	28%	0.04
Yes (total)	1330	6284	21%	36	121	30%	0.02
Ever diagnosed with STI‡
Yes	388	6970	6%	3	154	2%	0.05