another participant was positive for cannabinoids. There were no positive breath alcohol tests on any sessions. When possible, each menstrual cycle phase blood samples were drawn for hormone assays in the morning before the tasks began (between 9–10 am) with the goal of measuring hormone levels on each woman at least once each menstrual cycle phase. Since women are often reluctant to have blood drawn repeatedly, participants were compensated $10 for each blood sample drawn for hormone levels. Hormone levels were obtained for 87% of the women. Weekly, urine pregnancy tests were performed. During sessions, cigarette smoking was only permitted after lunch, 30 min before an assessment battery (including vital signs) to limit the effects of nicotine on mood and performance.
