Table 1. Baseline characteristics of Grade 5 students who completed baseline and follow-up assessments and were dewormed following baseline assessment (n = 1,089), and of participating schools (n = 18), by intervention status, in Belen, Peru, April–June 2010.
| Variables | Intervention | Control |
| Individualcharacteristics | (n = 518) | (n = 571) |
| Sex (% female) | 46·0 | 50·8 |
| Age [mean (sd)] | 10·2 (1·1) | 10·4 (1·1) |
| Weight (kg) [mean (sd)] | 31·8 (6·3) | 32·0 (6·8) |
| Height (cm) [mean (sd)] | 134·3 (6·9) | 134·4 (7·4) |
| House material (% Brick) | 40·7 | 30·8 |
| Running water in home (%) | 74·3 | 75·0 |
| Have been dewormed in past (%) | 64·8 | 63·6 |
| Number of people in household [mean (sd)] | 7·0 (2·9) | 7·3 (3·2) |
| Number of <5 year olds in household [mean (sd)] | 0·8 (0·9) | 0·9 (1·0) |
| Socio-Economic Status | ||
| Lowest Quartile (%) | 30·2 | 22·6 |
| Second Quartile (%) | 24·8 | 24·5 |
| Third Quartile (%) | 21·3 | 26·1 |
| Highest Quartile (%) | 23·8 | 26·8 |
| Ascaris lumbricoides | ||
| Prevalence (%) | 49·2 | 55·5 |
| Intensity (EPG)* [mean (sd)] | 8456 (17744) | 9968 (22020) |
| Trichuris trichiura | ||
| Prevalence (%) | 59·1 | 64·8 |
| Intensity (EPG)* [mean (sd)] | 1045 (2841) | 832 (2344) |
| Hookworm | ||
| Prevalence (%) | 12·0 | 12·6 |
| Intensity (EPG)* [mean (sd)] | 43 (194) | 52 (417) |
| Any STH infection | ||
| Prevalence (%) | 72·2 | 78·1 |
| Schoolcharacteristics | (N = 9) | (N = 9) |
| Zone (% in flooding zone) | 44·4 | 44·4 |
| Number of levels in school [mean (sd)] | 1·44 (0·88) | 1·89 (1·05) |
| Number of students (Grade 1–6) [mean (sd)] | 516·7 (384·8) | 551·3 (421·8) |
| Water available in school (%) | 88·9 | 88·9 |
| Water is treated (%) | 44·4 | 11·1 |
| Bathroom present in school (%) | 88·9 | 100 |
| General hygiene score of bathrooms (score out of 8) [mean (sd)] | 2·25 (1·98) | 2·2 (0·97) |
| Soap available in school (%) | 22·2 | 22·2 |
*
EPG: eggs per gram; arithmetic mean.