The percentage of Americans who use alcohol, engage in high-risk drinking or have an alcohol use disorder has risen substantially, a new study finds.

The study, which included face-to-face interviews with 40,000 Americans, found alcohol use disorders increased 49 percent between 2001-2002 and 2012-2013, according to CNN.

Alcohol use has increased most among women, older adults, racial/ethnic minorities and the socioeconomically disadvantaged, the researchers report in JAMA Psychiatry. Alcohol use disorders rose 106.7 percent among individuals age 65 and older during the study period.

The researchers conclude that almost 30 million Americans are struggling with an alcohol use disorder.