In statistics, controlling for a variable is the attempt to reduce the effect of confounding variables on an observational study. It means that when looking at the effect of one variable, all other variable predictors are held constant.n statistics, controlling for a variable is the attempt to reduce the effect of confounding variables on an observational study. It means that when looking at the effect of one variable, all other variable predictors are held constant.
100,000 people a year die from alcohol abuse in the U.S. each year, 1,000,000 in ten years. 14 million, or one in 13 adults in the U.S. suffer from alcoholism at any given time. 25% of urban hospital beds are taken up by severe damage from the use of alcohol.
Americans between 20 and 64 were victims in the majority of alcohol-related deaths, so many of them would have lived for many more years if alcohol hadnât killed them (either directly or indirectly).