Table 3. Prevalence of G. duodenalis infection in children by type of water supply and stage, Northeast of Minas Gerais State, Brazil, 2009–2010.
| Stage 1 | Stage 2 | Stage 3 | ||||||||||
| Cistern group (Na = 332) | Comparison group (N = 332) | Cistern group (N = 332) | Comparison group (N = 332) | Cistern group (N = 337) | Comparison group (N = 327) | |||||||
| nb | % | n | % | n | % | n | % | n | % | n | % | |
| Positive | 14 | 4.8% | 31 | 10.9% | 22 | 9.2% | 38 | 16.7% | 25 | 10.5% | 17 | 7.6% |
| Negative | 278 | 95.2% | 253 | 89.1% | 217 | 90.8% | 189 | 83.3% | 214 | 89.5% | 208 | 92.4% |
| Total of exams | 292 | 100% | 284 | 100% | 239 | 100% | 227 | 100% | 239 | 100% | 225 | 100% |
a
N = initial number of monitored children.
b
n = number of exams after losses to follow-up.