Statement:
An average person in Oman drinks more alcohol than in Guinea

In the Alcohol average daily consumption rating Oman holds position #131 2016 out of 189 and Guinea is #141 out of 189 2016.
Position of Oman is worse than position of Guinea.
Both countries holds average positions in the "Alcohol average daily consumption" rating. So Both sexes is an average for both Oman and Guinea, compared to most countries of the World.

Referencies:

  1. Alcohol average daily consumption 2016 by WHO
    The countries in the rating sorted by 'Both sexes' in descending order.
    Guinea 'Both sexes' value is 12.5
    Oman 'Both sexes' value is 19.7