Summary statistics for the number of weeks that Letigen* was used at least once among women in the Danish National Birth Cohort (1996–2002).

*Letigen is composed of 20 mg ephedrine and 200 mg caffeine.†Total eligible time includes the 4 weeks prior to last menstrual period through gestational age 13 completed weeks, pre-conception includes the 4 weeks prior to last menstrual period through gestational age 2 completed weeks, early pregnancy includes gestational age 3–13 completed weeks.Abbreviations: SD, standard deviation.