Table 2.

Domain-specific analyses of correlates of nonmedical use of prescription medication

Characteristics	Bivariate analyses	Multivariate analysesa
	OR (95% CI)	OR (95% CI)
Sex, male	1.03 (0.83 to 1.28)	n/a
Substance use
Lifetime regular alcohol use	2.50 (2.02 to 3.09)	1.88 (1.50 to 2.35)
Number of illicit drugs used (≥2)	6.01 (4.54 to 7.95)	5.30 (3.97 to 7.08)
Mental health
Attention-deficit disorder with or without hyperactivity	2.34 (1.86 to 2.94)	1.74 (1.36 to 2.22)
Anxiety disorder	3.13 (2.38 to 4.10)	2.00 (1.46 to 2.74)
Depression	3.57 (2.69 to 4.73)	2.31 (1.69 to 3.16)
Social competency
Low self-esteem	2.39 (1.92 to 2.99)	1.91 (1.51 to 2.41)
Low self-control	2.98 (2.37 to 3.74)	2.69 (2.12 to 3.40)
Low self-efficacy	1.76 (1.43 to 2.17)	1.14 (0.90 to 1.43)
Family domain
Low parental supervision	2.30 (1.82 to 2.89)	2.01 (1.59 to 2.55)
Low social support	2.39 (1.62 to 3.53)	1.46 (0.96 to 2.20)
Low participation in family life	2.17 (1.77 to 2.67)	1.67 (1.34 to 2.08)
Peer domain
Low social support and affection from friends	2.29 (1.46 to 3.60)	1.95 (1.21 to 3.16)
Low prosocial behaviours	2.92 (2.04 to 4.20)	2.64 (1.80 to 3.87)

^aControlling for variables within each domain

n/a = not applicable