Project HeartBeat! was uniquely designed to investigate the course of change in cardiovascular disease risk factors and several categories of covariates, including the anthropometric indicators addressed in this study. The data pertained to the 678 participants who entered the Project in 1991-93 at ages 8, 11 or 14 years of age, of whom 49.1 percent were female and 20.1 percent were black. Of the 395 participants who became eligible for 10 or more 4-monthly examinations, 349 (88.4 percent) completed at least 10 occasions; 538 participants of 556 who were eligible for seven or more examinations (96.8 percent) completed at least seven. Multi-level (MLn) analytic methods previously tested with other data were utilized for this analysis.