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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: Psychol Addict Behav. 2017 Feb 9;31(3):307–314. doi: 10.1037/adb0000260

Table 1.

Average Endorsement Rates of Alcohol and Substance Use

Drug Percentage of Endorsement
Any Use Thursdays Fridays Saturdays
Alcohol 99.3% 50.6% 75.0% 74.9%
Marijuana 41.6% 13.4% 13.5% 10.4%
Nicotine 36.2% 11.4% 11.2% 11.5%
ADHD medications 11.3% 1.9% 1.2% 2.7%
Cocaine 8.0% 0.8% 1.5% 1.2%
Sedatives 2.2% 0.4% 0.6% 0.4%
Ecstasy 1.3% 0.0% 0.2% 0.2%
Opioids 0.9% 0.1% 0.1% 0.2%
Other drugs 0.4% 0.0% 0.1% 0.0%
Amphetamines 0.2% 0.1% 0.0% 0.0%
Inhalants 0.0% 0.0% 0.0% 0.0%
Hallucinogens 0.0% 0.0% 0.0% 0.0%

ALC+

Alcohol + Marijuana 39.4% 9.0% 11.4% 12.3%
Alcohol + Nicotine 35.3% 8.4% 10.4% 10.7%
Alcohol + ADHD 10.2% 1.4% 1.0% 2.6%
Alcohol + Cocaine 7.8% 0.8% 1.4% 1.2%