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.
How many people die each year from drug use? About 570,000 people die annually in the U.S. due to drug use. That breaks down to more than 480,000 deaths related to tobacco, about 31,000 due to alcohol, nearly 22,000 due to overdose from illicit (illegal) drugs, and close to 23,000 due to overdose from prescription pain relievers. If you want more information, check out cdc.gov.