Household-wide ivermectin treatment for head lice in an impoverished community: randomized observer-blinded controlled trial
Daniel Pilger, Jorg Heukelbach, Adak Khakban, Fabiola Araujo Oliveira, Gernot Fengler & Hermann Feldmeier
Volume 88, Number 2, February 2010, 90-96
Table 2. Factors associated with the length of the infestation-free period in randomized controlled trial of ivermectin treatment for head lice, Fortaleza, CE, Brazil, 2007
| Factor | Hazard ratioa | 95% CI | P-value |
|---|---|---|---|
| Groupb | 1.47 | 1.01–2.17 | 0.048 |
| Sexc | 1.95 | 1.21–3.11 | 0.005 |
| Poverty index | 1.41d | 1.03–1.93 | 0.031 |
| Crowding | 1.06d | 0.90–1.24 | 0.477 |
| No. of sentinel children per household | 1.11d | 0.90–1.37 | 0.311 |
CI, confidence interval.
a Result of Cox regression.
b Control group versus intervention 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.
c Females versus males.
d The hazard ratio indicates the effect of a whole unit increase in the unit of measurement.