Risk compensation: a male phenomenon? Results from a controlled intervention trial promoting helmet use among cyclists.

Prevention tools are challenged by risky behaviors that follow their adoption. Speed increase following helmet use adoption was analyzed among bicyclists enrolled in a controlled intervention trial. Speed and helmet use were assessed by video (2621 recordings, 587 participants).

Factors associated with missing data in an experience sampling investigation of substance use determinants.

Background: The Experience Sampling Method (ESM) collects data repeatedly over time, and is therefore prone to missing observations. Little is known about the characteristics of the subjects and of the ESM procedure associated with unanswered records. Through an ESM investigation of substance use determinants, these characteristics were able to be analyzed.

Paradoxical increase of positive answers to the Cut-down, Annoyed, Guilt, Eye-opener (CAGE) questionnaire during a period of decreasing alcohol consumption: results from two population-based surveys in Ile-de-France, 1991 and 2005.

Aims: To describe trends of responses to the Cut-down, Annoyed, Guilt, Eye-opener (CAGE) questionnaire during a period of declining alcohol consumption, in a country with no temperance history.

Design: Two random-sample surveys, conducted in 1991 and 2005, respectively.

Setting: The adult population of Ile-de-France.