Table 1 Characteristics of children who were infected with any STH at recruitment and presented at the 15-month follow-up point (n =1 141), by treatment group
| Treatment group | ||
|---|---|---|
| Characteristicsa |
Annual treatment (N = 562) |
Four-monthly treatment (N = 579) |
| Characteristics | ||
| Sex, male | 54.8 (308/562) | 53.4 (309/579) |
| Age, years | 10.3 (2.5) | 10.4 (2.5) |
| Thin | 12.5 (70/562) | 11.1 (64/579) |
| Stunted | 27.2 (153/562) | 27.3 (158/579) |
| Underweightb | 6.12 (18/294) | 6.25 (19/298) |
| Hemoglobin, g/dL | 12.3 (1.3) | 12.3 (1.4) |
| Anemia | 36.0 (194/539) | 40.7 (227/558) |
| STH infection | ||
| Hookworm | 58.7 (330/562) | 59.9 (347/579) |
| Ascaris lumbricoides | 55.7 (313/562) | 56.7 (328/579) |
| Trichuris trichiura | 1.6 (9/562) | 1.2 (7/579) |
| Any STH infection | 100 (562/562) | 100 (579/579) |
| STH infection intensity (epg) | ||
| Hookworm | 106 (66–185) | 180 (98–330) |
| A. lumbricoides | 3 234 (2 539–4 119) | 2 605 (1 968–3 449) |
| Household characteristics | ||
| Socioeconomic status | ||
| Poor | 64.3 (342/532) | 64.1 (356/555) |
| Less poor | 35.7 (190/532) | 35.9 (199/555) |
| Water source | ||
| Non-improved drinking water | 6.7 (36/538) | 3.5 (20/558) |
| Improved drinking water | 93.3 (502/538) | 96.4 (538/558) |
| Floor | ||
| Mud | 95.2 (513/539) | 94.1 (526/559) |
| Cemented | 4.8 (26/539) | 5.9 (33/559) |
| Pit latrine | ||
| No | 11.3 (61/539) | 11.6 (65/560) |
| Yes | 88.7 (478/539) | 88.4 (495/560) |
| School-level characteristics | ||
| Baseline school prevalence | ||
| Hookworm | ||
| < 33% | 31.3 (176/562) | 36.8 (213/579) |
| 34–45% | 35.6 (200/562) | 32.5 (188/579) |
| > 45% | 33.1 (186/562) | 30.7 (178/579) |
| A. lumbricoides | ||
| <27% | 35.4 (199/562) | 38.8 (225/579) |
| 28–30% | 26.2 (147/562) | 26.9 (156/579) |
| > 40% | 38.4 (216/562) | 34.2 (198/579) |
| School mean infection intensity | ||
| Hookworm | ||
| 6–35 | 31.3 (176/562) | 36.8 (213/579) |
| 44–90 | 35.6 (200/562 | 32.5 (188/579) |
| 102–453 | 33.1 (186/562) | 30.7 (178/579) |
| A. lumbricoides | ||
| 366–913 | 34.3 (193/562) | 41.5 (240/579) |
| 914–2497 | 29.7 (167/562) | 29.0 (168/579) |
| > 2497 | 35.9 (202/562) | 29.5 (171/579) |
| Latrine cleanliness | ||
| Clean | 47.8 (269/562) | 53.4 (309/579) |
| Dirty | 26.3 (148/562) | 26.8 (155/579) |
| Very dirty | 25.8 (145/562) | 19.9 (115/579) |
| Children per latrine | ||
| < 50:1 | 42.9 (241/562) | 42.0 (243/579) |
| > 50:1 | 57.1 (321/562) | 58.0 (336/579) |