Past-year prevalence of nonmedical and medical use of prescription opioid analgesics by sex among Ontario students in grades 7 to 12 in 2007: Percentages are weighted estimates.
| SEX | UNWEIGHTED N | NONMEDICAL OPIOID USE ONLY, % (95% CI) | BOTH NONMEDICAL AND MEDICAL OPIOID USE, % (95% CI) | MEDICAL OPIOID USE ONLY, % (95% CI) | NO USE, % (95% CI) |
|---|---|---|---|---|---|
| Male | 1439 | 5.8 (4.5–7.3) | 12.0 (10.0–14.2)* | 23.9 (21.4–26.6) | 58.4 (55.3–61.5)* |
| Female | 1475 | 6.7 (5.3–8.5) | 16.6 (14.1–19.6)* | 26.9 (24.5–29.5) | 49.7 (46.8–52.6)* |
| Total | 2914 | 6.2 (5.3–7.3) | 14.4 (12.6–15.9) | 25.2 (23.5–27.2) | 54.2 (52.2–56.4) |
CI—confidence interval.
↵* Significant percentage differences between male and female students, χ2 P = .001.