Table 4 Incidence of malaria episodes (fever and parasitemia >2500/μl) by haemoglobin genotype and season
Season | Haemoglobin genotype | Number of children | Number of episodes | Mean number of episodes per child | Total person- years | Incidence rate (95% CI) (per person-year) |
|---|---|---|---|---|---|---|
Low | AA | 331 | 184 | 0.6 | 177.0 | 1.0 (0.9, 1.2) |
AC | 68 | 31 | 0.5 | 37.1 | 0.8 (0.6, 1.2) | |
AS | 37 | 15 | 0.4 | 20.4 | 0.7 (0.4, 1.2) | |
CC | 10 | 1 | 0.1 | 5.8 | 0.2 (0.0, 1.0) | |
SC | 5 | 1 | 0.2 | 2.8 | 0.4 (0.0, 2.0) | |
SS | 1 | 0 | 0.0 | 0.6 | 0.0 (0.0, 6.4) | |
Total | 452 | 232 | 0.5 | 243.6 | 1.0 (0.8, 1.1) | |
High | AA | 305 | 363 | 1.1 | 112.4 | 3.2 (2.9, 3.6) |
AC | 64 | 74 | 1.1 | 23.0 | 3.2 (2.5, 4.0) | |
AS | 35 | 35 | 0.9 | 13.1 | 2.7 (1.9, 3.7) | |
CC | 9 | 8 | 0.8 | 3.7 | 2.2 (0.9, 4.3) | |
SC | 5 | 5 | 1.0 | 1.8 | 2.9 (0.9, 6.7) | |
SS | 1 | 0 | 0.0 | 0.4 | 0.0 (0.0, 8.8) | |
Total | 419 | 485 | 1.1 | 154.4 | 3.1 (2.9, 3.4) | |
Low and High | AA | 331 | 542 | 1.6 | 288.0 | 1.9 (1.7, 2.0) |
AC | 68 | 104 | 1.5 | 59.8 | 1.7 (1.4, 2.1) | |
AS | 37 | 50 | 1.4 | 33.1 | 1.5 (1.1, 2.0) | |
CC | 10 | 9 | 0.9 | 9.3 | 1.0 (0.4, 1.8) | |
SC | 5 | 6 | 1.2 | 4.5 | 1.3 (0.5, 2.9) | |
SS | 1 | 0 | 0.0 | 1.0 | 0.0 (0.0, 3.7) | |
Total | 452 | 711 | 1.6 | 395.7 | 1.8 (1.7, 1.9) |