Drug screened

Males

N = 468 F (%)

Females

N = 282 F (%)

Total %

P value

THC

30 (6.4)

0

3.9

<0.0001*

Tramadol

16 (3.4)

1 (0.35)

1.9

0.02

BZDs

4 (0.85)

1 (0.35)

0.67

0.62

Opium

4 (0.85)

0

0.47

0.18

Barbiturates

4 (0.85)

0

0.47

0.18

Amphetamine

0

0

0

0

Cocaine

0

0

0

0

All drugs

54 (11.5)

2 (0.71)

7.41

<0.0001*