[Comparison of two types of behavior and attitude surveys on alcohol, tobacco and illegal drug use].
BACKGROUND: The aim of this study was to compare the results of two types of surveys frequently used in France to monitor alcohol, tobacco and illegal drug consumptions. METHODS: Data from a random sample phone survey (1993 18-75 year old French adults in November and December 1995), a quota sample face-to-face survey (1000 18-75 year old French adults in November 1995) and other sources (sales statistics and other surveys) were compared. RESULTS: Results from the two types of surveys were similar for alcohol and tobacco consumption prevalence. Concerning smoking prevalence, the random survey gave an estimate of 35.5% for the smokers ratio versus 35.2% with the quota sample survey. The daily alcohol consumer percentage was 20.9% and 22.1% respectively with the random and the quota sample surveys. Differences were observed for attitudes and illegal substances consumption: the random sample phone survey estimated at 15.5% people using drug during their life versus 13.9% for the quota sample face-to-face survey. CONCLUSIONS: Quota sampling and face-to-face surveys can be used to monitor alcohol, tobacco consumption and to a lesser extent, drug consumption trends, especially by repeated surveys, instead of random sample phone survey which are more time and money consuming.