Before intervention | After intervention | |
Total kits (n) | 257 130 | 175 947 |
Anonymous kits (n) | 2987 | 840 |
Anonymous kits per 1 000 kits (95% CI) | 11.6 (11.2 to 12.0) | 4.8 (4.5 to 5.1) |
Prevalence ratio (95% CI) | Reference | 0.41 (0.38 to 0.44) |
Prevalence difference per 1000 kits (95% CI) | Reference | −6.8 (−6.3 to −7.4) |