Comparability
Slight changes in the universe between 2003-2004 may compromise comparability between pre-2004 and 2004-forward samples. Additionally, beginning in 2014, the number of drinks in one sitting is adjusted to five or more for men and four or more for women. This reduces the comparability with previous samples as women who had four drinks in a sitting would not have counted those occasions in previous samples. The variable is comparable for 1997-2003, 2004-2013, and 2014-forward.
