TABLE 3.
Relative risks of intervention-covariate effect on preterm delivery (n = 180)
| Intervention and covariates | Estimates of effect on preterm delivery | |||
|---|---|---|---|---|
| Univariate | Multivariate | |||
| RR (95% CI) | P value | aRR (95% CI) | P value | |
| Intervention | ||||
| Selenium | 0.32 (0.11–0.95) | 0.039 | 0.32 (0.11–0.96) | 0.041 |
| Placebo | 1.00 (ref) | 1.00 (reference) | ||
| Duration of intervention, weeks | ||||
| ≥14 | 0.31 (0.11–0.86) | 0.025 | 0.32 (0.10–0.88) | 0.028 |
| <14 | 1.00 (ref) | 1.00 (reference) | ||
| Compliance to intervention | ||||
| Good | 0.86 (0.26–2.82) | 0.807 | - | - |
| Poor | 1.00 (ref) | - | ||
| Hemoglobin concentration, g/dl | ||||
| ≥10 | 1.56 (0.48–5.06) | 0.459 | - | - |
| <10 | 1.00 (ref) | - | ||
| CD4+ cells count/mm3 | ||||
| ≥350 | 0.79 (0.24–2.58) | 0.692 | - | - |
| <350 | 1.00 (ref) | - | ||
| Viral load, copies/ml | ||||
| ≥1000 | 1.59 (0.59–4.29) | 0.355 | - | - |
| <1000 | 1.00 (ref) | - | ||
Abbreviations: aRR, adjusted relative risk; CI, confidence interval; RR, relative risk.