2.3 Assessment of substance use, psychological functioning and menstrual phase
Substance use was assessed within all participants. For cocaine use severity and related problems in the past twelve months, the Drug Use Disorder Identification Test for cocaine (DUDIT)(Berman et al. , 2005) was used. In addition, the Time Line Follow-Back (TLFB) procedure(Robinson et al. , 2014) was completed to determine cocaine use (grams and days per month), alcohol use and cannabis use in the 28 days prior to study participation, as well as alcohol . The age of onset was measured by using an in-house questionnaire. Tobacco use was assessed using an in-house questionnaire (number of smoking days per week and cigarettes per day). Finally, a self-report questionnaire based on the Structured Clinical interview for the DSM (SCID)(First, 2015) was used to assess symptoms for CUD, cannabis use disorder, and alcohol use disorder.
All participants completed several self-report questionnaires in order to assess psychological functioning. Specifically, severity of depressive symptoms was measured using the Beck Depression Inventory (BDI-II)(BECK, 1961), state and trait anxiety was measured by using the State and Trait Anxiety Inventory (STAI)(Bados & Gómez-benito, 2010), attention deficit hyperactivity disorder (ADHD) symptom severity was assessed through the ADHD Rating Scale (ADHD-RS)(Sandra Kooij et al. , 2008), childhood trauma through the Childhood Trauma Questionnaire (CTQ)(Bernstein et al. , 2003) impulsivity was measured by using the Barratt Impulsiveness Scale (BIS-11)(Patton et al. , 1995) and education level was assessed with an in-house questionnaire.
Using an inhouse developed questionnaire, hormonal contraceptive use or menstrual phase was determined. For naturally cycling females, menstrual phase was determined using an in-house developed questionnaire that assessed averaged duration of the menstrual cycle and days since last menstruation. Based on this information, females were grouped as hormonal contraceptive users, being in the luteal phase of the menstrual cycle or being in the follicular phase of the menstrual cycle for exploratory analyses. See supplementary materials for more information.