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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.