Table 1. Observed prevalence and mean infection intensity by urine filtration and prevalence by microhematuria using reagent strip based on the first sample for all individuals and based on individuals with complete data, stratified by village (Tanzania survey, 1993 [27]).
| Village | Survey | Urine filtration | Reagent strip | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 day all | 1 day complete | 1 day all | 1 day complete | ||||||||||
| N | Positive (%) | μ+ | N | Positive (%) | μ+ | N | Positive T+1 (%) | Positive T-2 (%) | N | Positive T+1 (%) | Positive T-2 (%) | ||
| A | Baseline | 310 | 56.5 | 203.4 | 152 | 56.6 | 187.5 | 310 | 59.4 | 53.2 | 152 | 59.2 | 53.3 |
| 2 months | 288 | 15.3 | 9.5 | 17 | 17.6 | 2.3 | 288 | 24.0 | 19.4 | 17 | 23.5 | 17.6 | |
| 4 months | 204 | 12.3 | 37.8 | 20 | 0 | 0 | 204 | 23.0 | 20.1 | 20 | 20.0 | 20.0 | |
| 6 months | 241 | 40.7 | 13.6 | 14 | 28.6 | 8.0 | 241 | 33.6 | 25.7 | 14 | 21.4 | 14.3 | |
| 12 months | 219 | 37.9 | 31.1 | 91 | 35.2 | 24.6 | 219 | 47.5 | 32.4 | 91 | 49.5 | 31.9 | |
| 18 months | 164 | 70.1 | 41.0 | 1 | 100 | 5.0 | 164 | 100 | 76.8 | 1 | 100 | 0 | |
| 24 months | 122 | 57.4 | 23.5 | 0 | - | - | 122 | 100 | 75.4 | 0 | - | - | |
| B | Baseline | 178 | 82.6 | 189.2 | 138 | 86.2 | 179.4 | 178 | 87.6 | 59.0 | 138 | 91.3 | 62.3 |
| 2 months | 163 | 15.3 | 14.4 | 13 | 7.7 | 1.0 | 163 | 42.3 | 23.3 | 13 | 15.4 | 7.7 | |
| 4 months | 129 | 10.9 | 6.1 | 10 | 0 | 0 | 129 | 17.1 | 9.3 | 10 | 10.0 | 0 | |
| 6 months | 172 | 23.8 | 10.4 | 14 | 0 | 0 | 172 | 25.0 | 16.3 | 14 | 0 | 0 | |
| 12 months | 26 | 46.2 | 38.7 | 0 | - | - | 26 | 100 | 61.5 | 0 | - | - | |
| 18 months | 103 | 79.6 | 153.2 | 1 | 100 | 6.0 | 103 | 100 | 79.6 | 1 | 100 | 100 | |
| 24 months | 69 | 69.6 | 60.3 | 0 | - | - | 69 | 100 | 71.0 | 0 | - | - | |
N is the number of individuals tested; μ+ is the mean number of eggs per 10 ml of urine in the positive individuals.
1 Trace results are regarded as positive.
2 Trace results are regarded as negative.