Table 4.
Estimated Odds Ratiosa for the Association Between Smoking and Spontaneous Abortion According to Data Analysis Approach, Collaborative Perinatal Project, 1959–1965
| Missing-Data Process | Approach | |||||||
|---|---|---|---|---|---|---|---|---|
| Full Data | Complete-Case | Multiple Imputation | Augmented IPW | |||||
| OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| MCAR (data set 2) | 1.31 | 1.05, 1.64 | 1.39 | 1.06, 1.82 | 1.36 | 1.05, 1.77 | 1.42 | 1.09, 1.86 |
| MAR (data set 1) | 1.31 | 1.05, 1.64 | 0.43 | 0.19, 0.93 | 1.30 | 0.95, 1.77 | 1.40 | 1.00, 1.97 |
| MNAR (data set 3) | 1.31 | 1.05, 1.64 | 0.93 | 0.55, 1.57 | 1.14 | 0.81, 1.60 | 1.57 | 1.09, 2.23 |
Abbreviations: CI, confidence interval; IPW, inverse probability weighting; MAR, missing at random; MCAR, missing completely at random; MNAR, missing not at random; OR, odds ratio.
a Adjusted for age, race, and body mass index.