How do I understand how the score was used for the attached table/graph?

Current Use (previous 3 months) Low-risk use Moderate-risk use High-risk use Men % Women % Total % % % % (n = 348) (n = 817) Tobacco 49.4 41.2 (516)43.9 27.2 69.5 3.3 Alcoholb 80.5 73.9 (892)75.9 74.7 22.9 2.4 Marijuana 8.9 7.8 (95)8.1 44.6 54.3 1.1 Cocaine 1.4 0.2 (7)0.6 57.1 42.9 - -- Amphetamine-type stimulants 1.4 1.1 (14) 1.2 50.0 50.0 - -- Inhalants 0.6 0.2 (5)0.4 50.0 50.1 - -- Sedatives 2.9 4.4 (46) 3.9 51.1 46.7 2.2 Hallucinogens 0.3 0.6 (6)0.5 50.0 50.0 - -- Opioids 0.9 0.1 (4)0.3 100.0 -- - --- Other drugs 0.6 0.5 (7)0.6 66.7 33.3 Percentages based on total participants by sex. Percentages based on total users for each drug