In the study they say that 27% of the variance is explained by age. So the effect of alcohol consumption certainly is insignificant compared to the effect of ag

In the study they say that 27% of the variance is explained by age. So the effect of alcohol consumption certainly is insignificant compared to the effect of age. However, the authors think the effect of alcohol is notable because that 0.8% was still larger than any other factor they tested, like smoking.