Gender differences in blood alcohol concentration (BAC) over time. A total of 11 men and 12 women were administered alcohol over a period of 90 minutes (min). Although women received 12.5 percent less alcohol per kilogram of body weight than did men, both genders achieved an average peak BAC of approximately 0.08 percent. Measurements taken over the next 8 hours showed a more rapid decline of BAC in women than in men, indicating a faster alcohol disappearance rate in women