Reduction in weekly RTDs, by treated province
| Contrast | RTDs per week | 95% CI | P value |
| Treated vs untreated | −0.008 | −0.010 to 0.006 | <0.001 |
| Western Cape vs untreated | −0.005 | −0.008 to 0.001 | 0.005 |
| Gauteng vs untreated | −0.008 | −0.010 to 0.007 | <0.001 |
| KZN vs untreated | 0.003 | −0.001 to 0.007 | 0.157 |
Birth year, birth province, male sex and death week (dummy variables) included as fixed effects; observations were weighted by inverse probability of selection (no of deaths in a week).
KZN, KwaZulu-Natal; RTD, road traffic-related death.