Multivariate analysis for the risk of malaria infection using survey logistic regression with the interaction between survey and trial group.

°Representing the ratio between intervention and control group for the effect of time (odds time t/odds time 0). *“New stratum 1” = in a sensitivity analysis, clusters were re-assigned to 2 new strata based on the December 2004 parasite rate (New stratum 1≥20%; New stratum2<20%). #Point estimate of the interaction term obtained after exponentiation.