Table 3
Pediculosis during childhood and risk of childhood acute leukaemia
| Cases (n = 280) | Controls (n = 288) | OR* | 95% CI | |
|---|---|---|---|---|
| *Odds ratios adjusted for age, gender, hospital, ethnic origin, and maternal educational level. | ||||
| ‡Two children received preventive treatment without having pediculosis. | ||||
| Pediculosis | ||||
| Never | 180 | 195 | 1.0 | Reference |
| Ever | 98 | 90 | 1.6 | (1.0–2.6) |
| Missing | 2 | 3 | ||
| Once | 51 | 48 | 1.5 | (0.9–2.5) |
| Twice or more | 47 | 42 | 1.9 | (1.1–3.3) |
| Pediculosis treatments | ||||
| No treatment† | 179 | 194 | 1.0 | Reference |
| Insecticidal shampoo | 70 | 60 | 1.9 | (1.1–3.2) |
| Other (vinegar, sweet almond oil) | 1 | 3 | 0.3 | (0.03–2.9) |
| Missing | 30 | 31 | ||
| Pyrethroid | 65 | 55 | 2.0 | (1.1–3.4) |
| Pyrethroid only | 59 | 46 | 2.2 | (1.2–3.8) |
| Lindane (organochlorine) | 6 | 4 | 2.1 | (0.5–8.7) |
| Malathion (organophosphorus) | 5 | 10 | 0.7 | (0.2–2.4) |
