The Tracking Study of CATCH III, beginning in December 1994, followed the cohort through early adolescence in the sixth through eighth grades. The objectives were to measure the effects of CATCH II intervention programs on subsequent smoking prevalence rates during the end of the eighth grade and to observe the onset, development, and inter-correlation of cardiovascular risk factors from early to middle adolescence in the cohort. There were no CATCH interventions. Psychosocial measures, dietary fitness, and smoking data were collected annually. The full panel of physiological measures and biochemical validation of smoking was conducted during the last semester of eighth grade. CATCH III ended in November 1999. The study was active through November 2000 under U01-HL-47098, the coordinating center.