Smoking during pregnancy in Finland: determinants and trends, 1987-1997.

OBJECTIVES This study examined determinants of and trends in smoking during pregnancy in Finland from 1987 through 1997. METHODS A repeated cross-sectional investigation of 694,926 women was conducted. RESULTS The prevalence of smoking during pregnancy remained similar from 1987 through 1997 (at 15%). In 1997, prevalences of smoking were alarmingly high… (More)