LAUSR

BACKGROUND The public health impact of binge drinking depends on its population prevalence and its frequency and intensity among binge drinkers. The objective is to assess the consistency of time trends and age-sex disparities between binge-drinking prevalence and binge-drinking exposure indicators that combine such prevalence with the number of binge-drinking days among binge drinkers. METHODS Data come from 11 biennial national household surveys from 1997 to 2017 in young (15-34 years) and middle-aged adults (35-64 years) in Spain (n = 211,961). Binge-drinking was the intake of 5+ standard drinks (4+ in women from 2009 onwards) in approximately two hours. Three monthly indicators were analyzed: binge-drinking prevalence, population rate of binge-drinking days, and proportion of drinking days with binge drinking. Results were stratified for sex and two age groups. Annual percent changes (APCs), ratios of young to middle-aged people (age ratios) and men-to-women ratios were obtained from negative binomial regression. RESULTS Although the three indicators showed considerable consistency as an intense increase in binge drinking from 2009 to 2017 among middle-aged people, especially women, there were relevant inconsistencies. In 2009-2017 the APCs for prevalence and rate were +1.3 % and -1.6 %, respectively, in young women, and -0.6 % and -3.0 % in young men. Age ratios were significantly higher for prevalence and proportional ratio than rates, while men-to-women ratios were lower, especially in middle-aged people. CONCLUSIONS Adequate monitoring of binge drinking should incorporate indicators of absolute exposure, which better reflect its impact on public health, such as the population rate of binge-drinking days.