Table 5 Prevalence (with 95% confidence limits) by age group of malaria parasitaemia and three measures of mild malaria morbidity in highland and lowland hamlets from monthly surveys in each hamlet in the pre-intervention year
Altitude | Age group | |||
|---|---|---|---|---|
6 mo-2 yrs | 2–5 yrs | 6–12 yrs | ||
% with malaria parasites | High | 52.6 (49.0, 56.2) | 65.4 (63.3, 67.5) | 62.4 (60.4, 64.3) |
Low | 78.9 (75.3, 82.6) [3.26***(2.32, 4.58)] | 88.2 (86.5, 89.9) [4.21***(2.87, 6.18)] | 80.0 (78.1, 81.8) [2.52***(1.94, 3.26)] | |
% with malaria feverf | High | 4.8 (3.2, 6.3) | 3.8 (3.0, 4.7) | 1.4 (0.9, 1.9) |
Low | 12.4 (9.4, 15.4) [2.93***(1.95, 4.40)] | 5.8 (4.6, 7.1) [1.69**(1.16, 2.46)] | 1.0 (0.5, 1.5) [0.66 n.s. (0.33, 1.34)] | |
% anaemicw (Hb<8 g/dl) | High | 30.3 (26.9, 33.8) | 9.5 (8.1, 10.8) | 3.5 (2.7, 4.3) |
Low | 49.4 (44.7, 54.1) [2.19***(1.67, 2.87)] | 15.3 (13.3, 17.2) [1.74***(1.25, 2.44)] | 6.6 (5.4, 7.8) [1.86**(1.19, 2.95)] | |
% with spleno-megaly | High | 25.5 (21.9, 29.1) | 39.6 (37.1, 42.0) | 39.4 (37.2, 41.6) |
Low | 63.7 (58.3, 69.0) [5.41***(3.47, 8.43)] | 76.2 (73.5, 78.9) [4.87***(3.02, 7.86)] | 57.1 (54.4, 59.8) [1.99*** (1.36, 2.90)] | |