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Table 2 Efficacy of topical repellents against Plasmodium vivax

From: Are topical insect repellents effective against malaria in endemic populations? A systematic review and meta-analysis

Study Repellent Control Risk ratio (95% confidence intervals)
  Cases Population at risk Cases Population at risk
Chen-Hussey et al.[34] 14 3,947 16 3,961 0.88 (0.43-1.80)
Deressa et al. 1[29] 21 2,399 17 2,273 1.17 (0.62 - 2.21)
Hill et al.[33] 14 2,041 66 1,967 0.20 (0.12-0.36)
Kroeger et al. 2[37] 17.9%   24.1%   0.743
McGready et al. 4[36] 67 316 70 266 0.81 (0.60-1.08)
Rowland et al.[35] 103 618 62 530 1.42 (1.06-1.91)
Vittal et al. 5[38] 8 228 13 411 1.11 (0.47-2.64)
  1. 1Denominator is average of two follow up surveys, number of infections is combined total from two follow-up surveys - based on assumption that infections at 2-month time point were new infections (1 month between follow-up surveys); 2Trial conducted in two sites. This data is from Peru where according to manuscript 86% of cases were usually due to P. vivax. Since parasite species of cases was not determined, these cases were attributing to P. vivax; 3Counts and denominators not reported in manuscript so unable to calculate 95% confidence intervals; 4Cases and denominator back-calculated from percentages and confidence intervals reported in paper; 5Number of cases is combined total from two years of follow up.