Table 2. Baseline predictors of (A) S. haematobium and (B) S. mansoni infection probability across 29 co-endemic schools in Mali (n = 2477 children).
Parameter estimates (on the logit scale) are from binomial mixed models. χ2 and p values are from likelihood ratio tests comparing models with and without the term in question. Age was mean-centred in both analyses. ‘ref’ indicates the reference level of each factor.
| Variable | df | Parameter estimate (SE) | χ2 | p | |
|---|---|---|---|---|---|
| (A) S. haematobium | |||||
| (Intercept) | 0.016 (0.360) | ||||
| Age | 1 | 0.105 (0.024) | 18.760 | <0.0001 | |
| Age2 | 1 | -0.010 (0.012) | 0.766 | 0.3816 | |
| Sex | 1 | Male (ref) | 0 | 2.363 | 0.1243 |
| Female | -0.162 (0.105) | ||||
| S. mansoni infection | 3 | Uninfected (ref) | 0 | 51.066 | <0.0001 |
| Light | 0.914 (0.207) | ||||
| Moderate | 1.411 (0.276) | ||||
| Heavy | 1.940 (0.306) | ||||
| Region | 2 | Bamako (ref) | 0 | 19.015 | <0.0001 |
| Koulikoro | -0.894 (0.759) | ||||
| Ségou | 2.345 (0.545) | ||||
| (B) S. mansoni | |||||
| (Intercept) | -3.391 (0.562) | ||||
| Age | 1 | 0.161 (0.035) | 21.817 | <0.0001 | |
| Age2 | 1 | 0.006 (0.017) | 0.123 | 0.7253 | |
| Sex | 1 | Male (ref) | 0 | 2.808 | 0.0938 |
| Female | -0.255 (0.149) | ||||
| S. haematobium infection | 2 | Uninfected (ref) | 0 | 56.630 | <0.0001 |
| Light | 1.054 (0.202) | ||||
| Heavy | 1.861 (0.253) | ||||
| Region | 2 | Bamako (ref(A) | 0 | 13.499 | 0.0012 |
| Koulikoro | 4.441 (1.118) | ||||
| Ségou | 0.127 (0.807) | ||||