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COMT rs4680 Genotype and Smoking Cessation
| GG (Val/Val) | GA (Val/Met) | AA (Met/Met) | |
| First trimester | |||
| Smoking, n (%) | 295 (70) | 746 (73) | 410 (73) |
| Quit, n (%) | 126 (30) | 269 (27) | 152 (27) |
| Third trimester | |||
| Smoking, n (%) | 244 (58) | 587 (58) | 318 (57) |
| Quit, n (%) | 177 (42) | 429 (42) | 243 (43) |
Note. Analyses restricted to women who reported smoking cigarettes immediately prior to pregnancy (n = 2,001).
