Table 4. Adjusted prevalence ratios for single and combined deworming and household finished floor and relative excess risk due to interaction.
| Ascaris | Hookworm | Trichuris | |||||
|---|---|---|---|---|---|---|---|
| Deworming | Finished floor | n/N | aPR c (95% CI) | n/N | aPR c (95% CI) | n/N | aPR c (95% CI) |
| - | - | 141/847 | (ref) | 55/847 | (ref) | 177/847 | (ref) |
| + | - | 59/572 | 0.53 (0.39,0.71) | 31/572 | 0.93 (0.60,1.44) | 126/572 | 0.91 (0.75,1.11) |
| - | + | 9/110 | 0.60 (0.32,1.15) | 3/110 | 0.54 (0.16,1.87) | 23/110 | 1.12 (0.75,1.67) |
| + | + | 4/93 | 0.28 (0.11,0.75) | 1/93 | 0.27 (0.04,2.07) | 16/93 | 0.85 (0.54,1.33) |
| RERI b | 0.56 (-3.64,2.40) | -1.14 (—,—) d | -0.18 (-1.48,0.37) | ||||
aPRs adjusted for age, sex, household floor type, geographic district, household wealth, cluster-level wealth, and mother’s education level.
bRelative excess risk due to interaction (RERI). A RERI = 0 indicates no interaction on the additive scale, RERI>0 indicates synergistic interaction on the additive scale for monotonic aPRs, RERI>1 indicating synergistic interaction on the additive scale for non-monotonic aPRs, and RERI<0 indicates antagonistic interaction on the additive scale.
cPRs adjusted for age, sex, hygienic latrine access, geographic district, household wealth, cluster-level wealth, and mother’s education level
d95% Confidence intervals were not estimated because there were strata with fewer than 5 observations for this measure.