Table 3. Generalized linear mixed model (GLMM, see S2 and S3 Tables) comparing change in prevalence for control programs using: MDA with praziquantel, snail control primarily (snail control), both (MDA + snail control), or minimal control (<30% coverage, “low coverage,” not shown).
| Description | Predictor | Estimate* (X 10−2) | p-value |
|---|---|---|---|
| Interaction terms** | Control duration:time | 0.02 | <0.001 |
| Island:time | 1.1 | <0.001 | |
| Improved water (contemporary % with access):time | 0.09 | <0.001 | |
| GDP per capita (inflation adjusted):time | 1.2 | 0.0013 | |
| Baseline prevalence:time | -0.04 | <0.001 | |
| Engineering controls:time | 0.09 | 0.79 | |
| MDA:time | -2.3 | <0.001 | |
| Snail control:time | -12.3 | <0.001 | |
| Both (MDA + snail control):time | -7.9 | <0.001 |
*The estimate indicates the change in prevalence over time where more negative (positive) values indicate stronger prevalence reduction (increase) associated with that predictor.
Random effects for country/territory (intercept): variance = 2.06, std. dev. 1.44
N = 44 countries/territories evaluated.
**These are predictors association with change in prevalence over time (years) in each country/territory