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Table 1 Seasonal (temporal) clustering of P. falciparum infection at the household level at four West African study sites in Mali (n = 2), Senegal (n = 1) and The Gambia (n = 1)

From: Clustering of asymptomatic Plasmodium falciparum infection and the effectiveness of targeted malaria control measures

Study site(s)Location of study site (based on GPS)Mean rainy season prevalence of infectionMean dry season prevalence of infectionRainy vs. dry season (t-test)# houses selectedAnnual rainfall
LatitudeLongitude% Pos(SD)% Pos(SD)p-value# Housesmm
Dangassa, Mali12.11 N− 8.33 W44.5(22.5)37.6(19.0)0.00032391023
Dioro, Mali13.45 N− 6.27 W31.5(19.7)17.0(16.1)< 0.0001305591
Gambissara, The Gambia13.32 N− 14.22 W4.4(10.4)9.1(14.6)0.0021411038
Madina Fall, Senegal14.81 N− 16.92 W0.4(1.9)1.0(4.6)0.146146503
Totals       Ʃ 831Ʃ = 2705
  1. GPS coordinates (latitude and longitude) are provided for each study site in columns 2 and 3, mean household prevalences of infection (percent of positive thick smears for each household) are in columns 4 and 6 and the standard deviations for those prevalences are in columns 5 and 7 (for the rainy and dry seasons, respectively). The numbers of households selected randomly from these sites which agreed to participate in this study are listed in column 9 for each study site and the annual rainfall totals for each site are listed in column 10. Testing to determine whether prevalences of infection were different in the dry vs. wet seasons was performed using the GraphPad QuickCalcs t-test calculator (; the results of that testing are in column 8