Outcomes of a technology-based social norms intervention to deter alcohol use in freshman residence halls.

Objective: The authors tested a prototype intervention designed to deter alcohol use in residence halls.

Participants: Approximately 384 freshmen participated in the study over a 2-year period.

Methods: The authors devised a feedback method that assessed residents' blood alcohol concentration (BAC) at night and allowed the readings to be retrieved the next day via the Web.