Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Latent growth curves for past month smoking and alcohol use from grades 5 to 9. Separate models for smoking and alcohol use at each grade were regressed on time-varying measures of neighborhood, family, and peer factors controlling respectively for average growth in smoking and alcohol use from grades 5 to 9.
