Evaluation of Heterogeneity of Effect of Azithromycin vs Placebo Distribution on Child Mortality by Distance
REGRESSION
To aid interpretation of the interaction, outcomes were estimated at specific distances from health centers that were chosen to align with thresholds at which the Niger health system distributes different community services.Adjusted incidence rate ratios were estimated using negative binomial regression and adjusted for community mean age. For the measure of effect modification on a multiplicative scale, the ratio of adjusted incidence rate ratios was 0.97 (95% CI, 0.95-0.99; 