Psychosocial correlates of body mass index in four groups of Quebec adults.

The objective of the present analysis was to study the associations between body weight psychosocial correlates and body mass index (BMI) among four groups of adults in the Quebec population. Data were taken from the Social Lifestyles and Health 1998 Survey performed by the Institut de la Statistique du Québec (ISQ). The suggested guidelines of the ISQ were used to estimate the population's proportions and for statistical analysis.

Social structure, social cognition, and physical activity: a test of four models.

Objective: This study investigated the combined influence of social structural factors (e.g. income) and cognitions in predicting changes in physical activity.

Mechanism by which BMI influences leisure-time physical activity behavior.

Objective: The objective of this prospective study was to clarify the mechanism by which BMI influences leisure-time physical activity. This was achieved in accordance with the assumptions underlying the Theory of Planned Behavior (TPB), considered as one of the most useful theories to predict behavior adoption.

Methods And Procedures: At baseline, a sample of 1,530 respondents completed a short questionnaire to measure intention and perceived behavioral control (PBC), the two proximal determinants of behavior of TPB.

Stages of motivational readiness for physical activity: a comparison of different algorithms of classification.

Objective: The aim of this study was to compare two approaches to classify individuals into stages of motivational readiness for physical activity and test which one was better explained by attitude and perceived behavioural control, as defined by Ajzen (1991).

Design: A survey of 20,430 respondents from a population-based sample.

Methods: The relevant variables were assessed in a self-administered questionnaire.