| TB(n = 178) | Contacts(n = 130) | Mean difference(95% CI) | p Value | |
| Mean (SE) | 20.1 (1.0) | 30.8 (1.7) | 10.7 (7.1 to 14.3) | <0.001 |
| Dark skinned | 19.0 (1.2) | 27.8 (1.5) | 8.8 (5.2 to 12.4) | <0.001 |
| Mid coloured | 20.9 (1.7) | 43.8 (8.5) | 22.9 (11.5 to 34.3) | <0.001 |
| Light skinned | 24.4 (3.6) | 36.7 (4.9) | 12.3 (−6.7 to 18.0) | 0.053 |
| Numbers withvitamin D concentrations | χ2 (2df) | |||
| <20 nmol/l | 106 (60%) | 36 (28%) | ||
| 20–39 nmol/l | 61 (34%) | 57 (45%) | 39.99 | <0.001 |
| 40+ nmol/l | 11 (6%) | 35 (27%) |