Summary of counts, fetus-time at risk, and rates per 10,000 for variables stratified on spontaneous abortion (SAB) vs. other pregnancy outcomes for the Danish National Birth Cohort (1996–2002).

*Observed fetus days at risk (i.e. time from entry to outcome, censoring, or end of risk period).†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, missing time includes Letigen use during an undefined time.§1 cigarette = 1 cigarette equivalent, 1 cherrot = 2 cigarettes equivalents, 1 cigar = 2 cigarette equivalents, 1 pipe = 1.5 cigarette equivalents.