Table 1. Characteristics of cases and controls.
| Characteristic | Cases (n = 410) | Controls (n = 594) |
| Child gender (male/female) | 221/189 | 305/289 |
| Mean child age at latest available checkup (months) | 30 (13–51) | 24 (7–44) |
| Monthly family income (US$) | 158 (20–1000) | 185 (30–1400) |
| Maternal educational levela | 3 (1–7) | 4 (1–7) |
| Crowding (occupants/bedroom) | 3.7 (0.8–18) | 3.0 (0.8–13) |
| Number of household electric appliances | 2 (0–4) | 3 (0–4) |
| Water sources | ||
| Potable | 33.9% (n = 139) | 30.6% (n = 182) |
| Piped | 11.5% (n = 47) | 10.9% (n = 65) |
| Well | 45.4% (n = 186) | 52.5% (n = 312) |
| River, stream, or rain | 5.1% (n = 21) | 2.9% (n = 17) |
| Potable & well | 1.5% (n = 6) | 1.7% (n = 10) |
| Other combinations | 2.7% (n = 11) | 1.3% (n = 8) |
| Bathroom facility | ||
| Latrine | 75.9% (n = 311) | 71.7% (n = 426) |
| WC | 19.5% (n = 80) | 25.9% (n = 154) |
| Field | 4.6% (n = 19) | 2.4% (n = 14) |
| Number of checkups | 4 (1–6) | 3 (1–6) |
| Childhood infection status | ||
| Either | 100% (n = 410) | 0% |
| Single infections with A. lumbricoides | 19.9% (n = 200) | 0% |
| Infection intensity (epg) | 5 (0–124,740) | 0 (0–0) |
| Single infections with T. trichiura | 7.0% (n = 70) | 0% |
| Infection intensity (epg) | 4 (0–30,310) | 0 (0–0) |
| Both | 23.6% (n = 140) | 0% |
Cases are children infected with either A. lumbricoides or T. trichiura, and controls are uninfected children. Values are frequencies (separated by/), percentages (%), and medians (range in parentheses). epg – eggs per gram of stool.
a
1 = illiterate, 2 = primary incomplete, 3 = primary, 4 = secondary incomplete, 5 = secondary, 6 = advanced incomplete, 7 = advanced.