Table 7. Prevalence (%) of maternal cigarette smoking in cases and controls.
|
Time point |
||||
|---|---|---|---|---|
| Preconception | 1st trimester | 2nd trimester | 3rd trimester | |
| Cases | 33.7 | 25.7 | 22.4 | 22.4 |
| Controls | 33.7 | 26.9 | 24.2 | 23.9 |
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