| Characteristic | % of males infected | % of females infected | Total %infected | p Value* |
| Age group (years) | <0.001 | |||
| <16 | 1.8 (1/56) | 5.4 (33/609) | 5.1 (34/665) | 0.2 |
| 16–19 | 6.0 (49/817) | 5.0 (221/4438) | 5.1 (270/5255) | 0.2 |
| 20–24 | 5.8 (40/695) | 2.0 (70/3499) | 2.6 (110/4194) | <0.001 |
| Ethnicity | <0.001 | |||
| Asian subcontinent | 13.3 (2/15) | 1.2 (1/81) | 3.1 (3/96) | 0.06 |
| Black African | 5.8 (11/190) | 2.0 (17/841) | 2.7 (28/1031) | <0.01 |
| Black British/other black | 7.0 (33/474) | 5.2 (89/1708) | 5.6 (122/2182) | 0.1 |
| Black Caribbean | 8.5 (32/378) | 5.2 (86/1650) | 5.8 (118/2028) | <0.05 |
| Chinese/other Asian | 0 (0/14) | 0 (0/135) | 0 (0/149) | – |
| Mixed | 7.6 (7/92) | 5.3 (43/811) | 5.5 (50/903) | 0.4 |
| Other ethnic groups | 0 (0/20) | 1.9 (3/155) | 1.7 (3/175) | 0.7 |
| Unknown/not specified | 0 (0/36) | 5.2 (11/210) | 4.5 (11/246) | 0.2 |
| White | 1.4 (5/347) | 2.5 (74/2953) | 2.4 (79/3300) | 0.2 |
| Reason for testing | <0.001 | |||
| Contact | 12.3 (37/300) | 18.1 (66/364) | 15.5 (103/664) | <0.05 |
| Diagnostic | 15.4 (19/123) | 3.1 (81/2629) | 3.6 (100/2752) | <0.001 |
| Screening | 3 (34/1145) | 3.2 (177/5553) | 3.2 (211/6698) | 0.7 |
*Mantel-Haenszel x2 test.