Table 2.
Proportions of children infected with hookworm and Ascaris lumbricoides, and average intensity of infections at baseline and 15 months after treatment (n = 1141), by treatment group
| Proportion infected, % (95% CI) | Intensity of infection, epg (95% CI) | |||
|---|---|---|---|---|
| Treatment group | Single | Four-monthly | Single | Four-monthly |
| Hookworm | ||||
| Baseline (Feb–Jun 2013) | 58.7 (50.3–68.5) | 59.9 (52.5–68.4) | 111 (67–185) | 180 (98–330) |
| 15-month follow-up (Sept 2014) | 18.3 (14.4–23.3) | 5.7 (4.2–7.7) | 126 (47–336) | 7 (3–15) |
| Relative reduction (%) | 68.8 | 90.5 | Increase: 13.5 | 96.1 |
| Odds ratio (95% CI) | 0.09 (0.07–0.13) | 0.02 (0.01–0.04) | 0.59 (0.31–1.14) | 0.03 (0.02–0.07) |
| P 1 | <0.001 | <0.001 | 0.116 | <0.001 |
| A. lumbricoides | ||||
| Baseline (Feb–Jun 2013) | 56.7 (46.7–66.4) | 55.7 (47.9–66.9) | 3 234 (2 539–4 119) | 2 606 (1 968–3 449) |
| 15-month follow-up (Sept 2014) | 23.3 (17.6–30.8) | 6.2 (3.7–10.5) | 2 504 (1 717–3 651) | 117 (56–244) |
| Relative reduction (%) | 58.9 | 88.7 | 22.6 | 95.5 |
| Odds ratio (95% CI) | 0.09 (0.06–0.13) | 0.01 (0.01–0.03) | 0.64 (0.57–1.10) | 0.01 (0.01–0.04) |
| P 1 | <0.001 | <0.001 | 0.095 | <0.001 |
1 P-values were obtained using mixed-effect logistic and negative binomial regression analyses with random intercepts for schools