Statement:
An average person in Jamaica drinks less alcohol than in Guinea-Bissau

In the Alcohol average daily consumption rating Jamaica holds position #116 2016 out of 189 and Guinea-Bissau is #67 out of 189 2016.
Position of Jamaica is better than position of Guinea-Bissau.
Both countries holds average positions in the "Alcohol average daily consumption" rating. So Both sexes is an average for both Jamaica and Guinea-Bissau, 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-Bissau 'Both sexes' value is 35.6
    Jamaica 'Both sexes' value is 25.8