| Intensity of infection (N and %) | |||
---|---|---|---|---|
 | No infection | Light infection | Moderate/heavy infection sex χ 2 | (P-value) |
Variables | ||||
Age | ||||
 6–9 years | 953 (89.1) | 93 (8.7) | 23 (2.2) | 4.1 (0.13) |
 10–15 years | 765 (91.7) | 52 (6.2) | 17 (2.0) |  |
Sex | ||||
 Female | 871 (91.3) | 66 (6.9) | 17 (1.8) | 2.5 (0.29) |
 Male | 843 (89.2) | 79 (8.4) | 23 (2.4) |  |
Altitude | ||||
 Plateau | 570 (85.3) | 67 (10.0) | 31 (4.6) | 42.7 (0.001) |
 Valley | 1 156 (93.0) | 78 (6.3) | 9 (0.7) |  |