Table 1. Demographic and socioeconomic characteristics of the study population and infestation status after 60 days of follow-up, Fortaleza, CE, Brazil, 2007.
| Characteristic | Intervention group | Control group | P-valuea |
|---|---|---|---|
| No. of households/no. of sentinel children | 38/64 | 40/68 | 0.66 |
| Median no. of individuals per household (range) | 6 (3–10) | 5 (2–11) | 0.27 |
| No. of females (%) | 49 (77) | 47 (69) | 0.33 |
| No. of males (%) | 15 (23) | 21 (31) | |
| Median monthly household income in R$b (range) | 350 (60–800) | 350 (60–945) | 0.32 |
| No. of households with ≥ 2 sentinel children (%) | 13 (34) | 19 (46) | 0.2 |
| Mean age in years (SD) | 9.6 (2.5) | 9.5 (2.6) | 0.77 |
| No. free of head lice after 60 days (%) | 10 (16) | 3 (4) | 0.03 |
| No. lost to follow-up (%) | 4 (6) | 2 (3) | 0.44 |
R$, Brazilian real; SD, standard deviation. a Intervention group versus control group. In the intervention group, all family members of sentinel children who lived in the same household as the children were treated with ivermectin; in the control group, no family member was treated. b 1 R$ ≈ 0.50 US$.