Secular Trends in Adolescent Never Smoking From 1990 to 1999 in California: An AgePeriodCohort Analysis
Xinguang Chen, MD, PhD,
Guohua Li, MD, DrPh,
Jennifer B. Unger, PhD,
Xiaowei Liu, MS and
C. Anderson Johnson, PhD
At the time of this study, Xinguang Chen was with the University of Southern California Keck School of Medicine, Los Angeles. Jennifer B. Unger, Xiaowei Liu, and C. Anderson Johnson are with the University of Southern California Keck School of Medicine. Guohua Li is with the Johns Hopkins University School of Medicine, Baltimore, Md.
FIGURE 2—Estimated age, period, and cohort effects from an ageperiodcohort modeling analysis of trends in adolescent never smoking in California, 19901999.