A comparison of the demographic and behavioural characteristics of National Chlamydia Screening Programme (NCSP) participants relative to the general population aged 16–24 years, according to Natsal-2, by gender
| Gender, data source, all | Natsal-2 (2000) 1289, 995* | Men NCSP (2008) 176 430 | Natsal-2 (2000) 1251, 1185* | Women NCSP (2008) 361 689 | p Value | |
| n (%)† | n (%) | p Value | n (column %)† | n (column %) | ||
| Age, y | ||||||
| 16–17 | 207 (16) | 51 453 (29) | p<0.001 | 193 (15) | 103 568 (29) | p<0.001 |
| 18–19 | 267 (21) | 51 600 (29) | 276 (22) | 96 126 (27) | ||
| 20–24 | 815 (63) | 73 377 (42) | 782 (63) | 161 995 (45) | ||
| Ethnicity | ||||||
| White | 1182 (92) | 103 303 (83) | p<0.001 | 1180 (94) | 245 053 (86) | p<0.001 |
| Black | 27 (2) | 9397 (8) | 9 (1) | 19 348 (7) | ||
| Other minority | 76 (6) | 11 112 (9) | 60 (5) | 20 680 (7) | ||
| Condoms used at last sex‡ | ||||||
| Yes | 661 (52) | 2744 (34) | p<0.001 | 456 (37) | 6051 (32) | p=0.007 |
| No | 602 (48) | 5347 (66) | 782 (63) | 12 639 (68) | ||
| 2+ sexual partners, last year‡ | ||||||
| <2 | 655 (53) | 40 234 (38) | p<0.001 | 845 (70) | 137 253 (53) | p<0.001 |
| 2+ | 586 (47) | 64 721 (62) | 363 (30) | 120 303 (47) | ||
↵* Weighted, unweighted denominators in Natsal-2.
↵† Natsal-2 counts and percentages are weighted.
↵‡ Condom use at last sex is asked about in less than 20% of NCSP areas, in which it is completed by around 50% of participants. 2+ sexual partners is asked of all NCSP participants, with around 67% completeness.