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Table 1 Baseline characteristics

From: Multiple clinical episodes of Plasmodium falciparum malaria in a low transmission intensity setting: exposure versus immunity

  Group of children
Characteristic Malaria-free Single-episode Multiple-episodes
Number 12 26 35
Age, median age in years (IQR) 1.67 (1.36 to 2.12) 1.52 (1.21 to 2.21) 1.78 (1.38 to 2.41)
Sex, number female (%) 4 /12 (33.33) 8/26 (30.77) 15/35 (42.86)
Hemoglobin AS, number (%)a,b 3 (27.27) 4 (17.39) 1 (3.13)
Proportion of cross-sectional surveys at which children were parasite positive by microscopy, proportion (%) 7.5 8 24.26
Malaria exposure index, median (IQR)c 0.39 (0.31 to 0.50) 0.54 (0.47 to 0.73) 0.65 (0.52 to 0.76)
  1. aData available for 11, 23 and 32 children in the malaria-free, single-episode and multiple-episodes groups respectively. bThere was a non-significant trend towards a larger proportion of children in the malaria-free group compared to single-episode and multiple-episodes groups having the sickle cell trait (Fisher’s exact test P = 0.054). cData available for 10, 21 and 24 children in the malaria-free single-episode and multiple-episodes groups respectively. Age is at the first sampling point in September 1998. IQR, interquartile range.