These cases were matched to 3,165 controls on age, menopausal status, current use of postmenopausal hormones, month, time of day and fasting status at the time of blood collection.
The effect of past experience on the current use of the tram extension on a day-to-day basis was also examined by using a mixed logit model with panel data.
Follow-up began on the day following the prescription fill and ended with the end of the study, the 25th birthday, loss of enrollment, death, failure to meet study inclusion/exclusion criteria, or 365 days following the last day of current use of the study psychotropic drug.
Follow-up began on the day following the prescription fill and ended with the end of the study, the 25th birthday, loss of enrollment, death, failure to meet study inclusion/exclusion criteria, or 365 days following the last day of current use of a study drug, whichever came first.
Smoking was defined as the current use of cigarettes at least once per day.
After changing the definition of current use to a 60-day window before surgery, ORs were somewhat higher for current use of oral glucocorticoids (aOR=1.63; 95% CI 0.77 to 3.46) and somewhat lower for recent users (aOR=0.97; 95% CI 0.44 to 2.17).
Current use of Chinese herbs was defined by self-reported use of any Chinese herb daily or nearly every day, for the last 30 days.
2 Medications in current use were allowed on the day of examination.
In the analysis of the association of air pollutants with tHcy, the following variables were chosen a priori as relevant predictors and included in the linear regression analysis: age, sex, body mass index, current cigarette smoking (0, 0 15, or > 15 cigarettes/day), current alcohol consumption (yes or no), current hormone use, day of the year, long-term time trend, and temperature.
Furthermore, use of the 90-day definition of current use could misclassify users with longer prescription coverage or suboptimal adherence as non-users of lipid-lowering agents.
Last-30-day use is a commonly used standard of current use, originating with the Centers for Disease Control.
