Table 2

Baseline characteristics: Mean (SD) age of patients in the group without follow-up was 40.10 (11.71) years and in the group with follow-up was 45.94 (13.38) years (P = .002).

CHARACTERISTICS	*NONINTERVIEWED SAMPLE WITH NO FOLLOW-UP,^ N= 129**	*INTERVIEWED SAMPLE WITH FOLLOW-UP,^ N=71**	P VALUE
Sex
• Female	26 (20)	23 (32)	.054
• Male	103 (80)	48 (68)	.054
Substances used^†
• Alcohol	121 (94)	53 (75)	< .001^‡
• Narcotic analgesics	45 (35)	31 (44)	.172
• Marijuana	67 (52)	29 (41)	.148
• Benzodiazepines	26 (20)	18 (25)	.396
• Cocaine	63 (49)	16 (23)	.001^‡
• Other^§	21 (16)	10 (14)	.682

↵* All percentages have been rounded.
↵† Twenty-eight patients used more than 1 substance problematically.
↵‡ Statistically significant values (α = 0.05).
↵§ Other substances include heroin, club drugs, or dimenhydrinate.