Comparison of the distribution of children included in the study in 2008 and 2009 by age and sex
| Variable | Sample | |
| Before treatment | After treatment | |
| Age 1–4 years | 1391 (55.3) | 1332 (55.4) |
| Age 5–9 years | 1126 (44.7) | 1072 (44.6) |
| Male | 1280 (50.9) | 1236 (51.4) |
| Female | 1237 (49.1) | 1169 (48.6) |
| Total | 2517 (100) | 2404 (100) |
Values are n (%).