Skip to main content

Table 3 Incidence rate of clinical malaria attacks and estimations from univariate analysis for a reasoned selection of weather variables (n = 4 531, except other indication)

From: Environmental determinant of malaria cases among travellers

  Number of clinical malaria attacks Number of individuals Number of person-days under survey Incidence rate per 1,000 person-month RR 95% CI p
Cumulated precipitation        
>180 mm of water by month*        
 <33% duration of stay 94 3665 454 512 2,52 1   
 ≥33% duration of stay 46 866 117 851 4,75 1,69 0,87 - 3,26 0,120
Water balance        
> +15 mm of water by month*        
 <66% duration of stay 83 3447 425 615 146 748 5,93 1   
 ≥66% duration of stay 57 1084 146 748 11,81 1,82 1.05 – 3.16 0,032
Consecutive dry week        
number of consecutive dry weeks in month        
By week (in continuous)      0,93 0,864 - 1,01 0,085
Evapotranspiration        
>150 mm of water by month        
 <33% duration of stay 120 4062 508 236 2,87 1   
 ≥33% duration of stay 20 469 64 127 3,80 1,31 0,58 - 2,95 0,518
Maximal temperature        
>30°C        
 <66% duration of stay 9 485 64 218 1,71 1   
 ≥66% duration of stay 131 4 046 508 145 3,14 1,53 0,61 - 3,87 0,368
Mean temperature        
>25°C        
 < 66% duration of stay 55 1 196 158 856 4,22 1   
 ≥66% duration of stay 85 3 335 413 507 2,50 0,73 0,419 - 1,28 0,271
Mean temperature        
By degree Celsius (in continuous)      0,95 0,79 - 1,15 0,629
Minimal temperature        
>20°C        
 < 33% duration of stay 38 693 93 009 4,97 1   
 ≥33% duration of stay 102 3 838 479 354 2,59 0,56 0,27 - 1,16 0,120
Urban area        
 <33% duration of stay 57 1 191 157 480 4,41 1   
 ≥33% duration of stay 83 3 340 414 883 2,44 0,50 0,30 - 0,86 0,011
  1. CI = confi dence interval; RR = relative risk; * estimates calculated with 0 months of decay.