Variable

n

%

Types of substance

Alcohol

Stimulants

Marijuana

Opiate

Sedatives/Hypnotics

Hallucinogens

Types of substance user

Polysubstance user

Single/No substance user

1204

1000

626

358

175

125

1042

907

61.8

51.3

32.1

18.4

9.0

6.4

53.5

46.5