Table 3.
Effect of Intervention on Smoking During Pregnancy
| Intervention group (10 clusters)
|
Control group (10 clusters)
|
Intervention effect
|
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Baseline rate n/N (%) | Follow-up period rate n/N (%) | ORa | Pb | Baseline rate n/N (%) | Follow-up period rate n/N (%) | ORa | Pb | RORc (95% CI) | Pd | |
| Continuous smoking | 330/1551 (21.3) | 424/1791 (23.7) | 1.14 (1.01–1.29) | .031 | 368/1757 (20.9) | 374/1729 (21.6) | 0.99 (0.88–1.11) | .814 | 1.16 (0.98–1.37) | .082 |
| Quit smoking during pregnancye | 57/387 (14.7) | 52/476 (10.9) | 0.74 (0.55–1.00) | .051 | 60/428 (14.0) | 33/407 (8.1) | 0.58 (0.43–0.78) | <.001 | 1.29 (0.84–1.97) | .239 |
CI = confidence interval.
a
Odds ratio (OR) comparing follow-up to baseline period calculated using Generalized Estimation Equation (GEE).
b
Significance of the OR of the time period.
c
Relative odds ratio (ROR) is the ratio of the odds ratio for the intervention group to the odds ratio for the control group.
d
Significance of the ROR. An ROR estimates statistically different from one implies a significant intervention effect.
e
The outcome “Quit smoking during pregnancy” was calculated considering as denominators the women who quit smoking during pregnancy plus the women who continued smoking during pregnancy.