We investigated how family characteristics and experiences during early adolescence predicted timing of sexual initiation. In addition, we investigated adolescent sex and race/ethnicity as potential moderating factors. As part of the Children of the National Longitudinal Survey of Youth-1979 (CNLSY-79), 799 adolescents aged 12 to 15 years provided…

Background: Postpartum women are a population at risk for sedentary living. Physical activity (PA) prior to pregnancy may be effective in predicting similar behaviour in the postpartum period. Objective: To test a composite version of the extended transtheoretical model (TTM) by adding "past behaviour" in order to predict PA behaviour…

The study tests the appropriateness of multiplicative versus additive expectancy-valency models for grouping motivational force decisions of 82 undergraduate students. Arguments are offered favoring a non-nested regression models analysis over a traditional hierarchical analysis of nested regression models. Discriminant analysis indicated one of…

A causal model to explain student attrition was tested at a major midwestern land-grant university with a sample of 1,513 full-time, unmarried freshmen who were 21 years old or younger. The causal model was reduced from 23 to 10 variables: an intent variable, three attitudinal variables, and two each of organizational, personal, and environmental…

A model of student attrition was synthesized from psychological, sociological, and educational sources, and contains six sets of variables: background, organizational, personal, environmental, attitudinal, and intent to leave. The model was tested with 1,909 full-time and unmarried university freshmen at a major midwestern university. The sample…