Association between Alcohol Consumption and Stroke in Nigeria and Ghana: A Case-control Study.

Background: The aim of the study was to examine the association between alcohol consumption and stroke in Nigeria and Ghana.

Methods: The study is a multicentre, case-control study. Cases included consenting adults 18 years of age and older with acute stroke. The controls were age- and gender-matched, stroke-free adults. Alcohol consumption was self-reported. The participants were classified into three alcohol-drinking status groups, which included abstainers, former drinkers, and current drinkers. The current drinkers were further classified into different alcohol drinking levels, including infrequent drinkers, light drinkers, moderate drinkers, heavy drinkers, and binge drinkers. Conditional logistic regression was used to determine associations between the drinkers' status and stroke, respectively, as well as the association between the different levels of current drinkers and strokes, respectively. Five models were evaluated. Model 1 was unadjusted. Model 2 had adjustments for demographic characteristics. Model 3 included Model 2, lifestyle and psychosocial function adjustments. Model 4 includes Model 3 and dietary factor adjustments. Model 5 included Model 4 and metabolic factor adjustments.

Results: A total of 7,368 participants took part in the study. Half were stroke participants, and half were control participants. On the associations between drinking status and strokes, respectively, former drinkers showed no significant association with strokes; however, there were significant associations between current drinkers and strokes in models 1 and 2, and the odds ratio of stroke risk was 1.19 (95% CI: 1.04-1.38; p<0.05) and 1.17 (95% CI: 1.01-1.36; p<0.05), respectively. Regarding the various levels of current drinkers and their association with stroke, no significant association was observed between light drinkers and stroke in model 5. In contrast, moderate drinkers, binge drinkers, and heavy drinkers showed a persistent and significant association with stroke, respectively.

Conclusion: There is a significant association between strokes and current alcohol consumption, especially among heavy, binge, and moderate drinkers.