Table 4.
Intensity of schistosomiasis infection of individuals expressed as geometric mean of S. mansoni eggs per gram of feces, by predictors in the multivariable model.
| Variable | No. infected individuals |
Mean egg counts (log10) | Geometri c mean | 95% CI | Tukey Grouping* |
|---|---|---|---|---|---|
| Age group | |||||
| < 14 | 89 | 1.83 | 67.99 | (47.23 – 97.88) | A |
| 15 – 29 | 99 | 1.91 | 80.88 | (58.29 – 112.23) | A |
| 30 – 44 | 59 | 1.80 | 63.40 | (42.58 – 94.42) | A, B |
| 45 – 65 | 58 | 1.36 | 23.06 | (15.45 – 34.43) | C |
| > 65 | 23 | 1.40 | 24.87 | (13.29 – 46.53) | B, C |
| Overall F-statistic = 8.94, num df = 4, den df = 100, p < .0001 | |||||
| Unsafe water contact | |||||
| Unsafe contact | 270 | 1.66 | 46.16 | (28.54 – 74.67) | A |
| No unsafe contact | 55 | 1.74 | 54.94 | (42.79 – 70.55) | A |
| Overall F-statistic = 0.49, num df = 1, den df = 24, p = .4893 | |||||
| Household possessions | |||||
| No car or motorbike | 312 | 1.72 | 52.19 | (41.28 – 65.99) | A |
| Car and/or motorbike | 16 | 1.72 | 52.81 | (21.41– 130.27) | A |
| Overall F-statistic = 0.00, num df = 1, den df = 115, p = .9800 | |||||
| Number of persons per room | |||||
| 1.3334 ≤ n < 4.00 | 103 | 1.93 | 85.79 | (53.76 – 136.90) | A |
| 0.80 ≤ n < 1.3334 | 94 | 1.74 | 54.49 | (35.70 – 83.15) | A, B |
| 0.60 ≤ n < 0.80 | 55 | 1.68 | 48.08 | (29.44 – 78.54) | A, B |
| 0 ≤ n < 0.60 | 76 | 1.57 | 37.49 | (25.04 – 56.12) | B |
| Overall F-statistic = 2.41, num df = 3, den df = 113, p = .0708 | |||||
| Education, head of household | |||||
| None | 209 | 1.71 | 50.73 | (37.85 – 70.00) | A |
| Some | 119 | 1.74 | 54.53 | (38.02 – 78.20) | A |
| Overall F-statistic = 0.09, num df = 1, den df = 115, p = .7587 | |||||
| Occupation, head of household | |||||
| Agriculture | 179 | 1.76 | 58.05 | (42.46 – 79.37) | A |
| All other occupations | 72 | 1.82 | 65.71 | (40.59 – 106.38) | A |
| Retired/handicapped | 77 | 1.55 | 35.28 | (22.77 – 54.66) | A |
| Overall F-statistic = 2.25, num df = 2, den df = 114, p = .1105 | |||||
| Place of residence | |||||
| Rural | 181 | 1.80 | 62.81 | (46.44 – 84.97) | A |
| VDG | 147 | 1.62 | 41.70 | (29.78 – 58.37) | A |
| Overall F-statistic = 3.22, num df = 1, den df = 115, p = .0753 | |||||
*
The mean egg counts for various levels of each variable were tested for significant differences. Those levels, within a variable, showing no statistically significant difference display the same letter. Those levels that are significantly different do not have the same letter.