Table 1.
Demographic Characteristics (%) of the Study Sample, the National Survey on Drug Use and Health (2000–08), United States
| Variable | 2000–02 % (95%CI) (n=45087) |
2003–05 % (95% CI) (n=49271) |
2006–08 % (95% CI) (n=48555) |
Total % (95% CI) (N=142913) |
|---|---|---|---|---|
| Gender | ||||
| Male | 50.8 (50.3, 51.3) | 51.1 (50.6, 51.5) | 51.4 (51.0, 51.9) | 51.1 (50.8, 51.4) |
| Female | 49.2 (48.8, 49.7) | 48.9 (48.5, 49.4) | 48.6 (48.1, 49.0) | 48.9 (48.7, 49.2) |
| Age (in years) | ||||
| 12- | 15.2 (14.9, 15.5) | 14.5 (14.2, 14.9) | 13.9 (13.6, 14.2) | 14.5 (14.3, 14.7) |
| 13- | 16.5 (16.2, 16.9) | 16.4 (16.1, 16.8) | 15.8 (15.5, 16.1) | 16.2 (16.1, 16.4) |
| 14- | 17.6 (17.2, 17.9) | 17.1 (16.7, 17.4) | 16.5 (16.2, 16.9) | 17.0 (16.9, 17.2) |
| 15- | 17.2 (16.8, 17.5) | 17.7 (17.4, 18.0) | 17.9 (17.5, 18.2) | 17.6 (17.4, 17.8) |
| 16- | 17.2 (16.8, 17.5) | 17.4 (17.0, 17.7) | 18.4 (18.0, 18.7) | 17.7 (17.5, 17.9) |
| 17- | 16.4 (16.0, 16.7) | 16.9 (16.6, 17.3) | 17.6 (17.2, 17.9) | 17.0 (16.8, 17.2) |
| Race | ||||
| White | 69.1 (68.7, 69.6) | 65.3 (64.9, 65.7) | 61.5 (61.1, 62.0) | 65.2 (65.0, 65.5) |
| Black | 12.4 (12.1, 12.7) | 12.9 (12.6, 13.2) | 13.3 (13.0, 13.6) | 12.9 (12.7, 13.1) |
| Hispanic | 12.5 (12.2, 12.8) | 13.8 (13.5, 14.1) | 16.2 (15.9, 16.6) | 14.2 (14.0, 14.4) |
| Others | 6.0 ( 5.8, 6.2) | 7.9 ( 7.7, 8.2) | 8.9 ( 8.7, 9.2) | 7.7 ( 7.5, 7.8) |
| Program exposure index (PEI) | ||||
| PEI = 0 | 4.1( 3.9, 4.2) | 3.7( 3.5, 3.8) | 4.8( 4.6, 5.0) | 4.2( 4.1, 4.3) |
| PEI = 1 | 11.4(11.1, 11.7) | 11.6(11.3, 11.9) | 12.3(12.0, 12.6) | 11.8(11.6, 11.9) |
| PEI = 2 | 18.2(17.8, 18.5) | 18.1(17.8, 18.4) | 18.6(18.3, 19.0) | 18.3(18.1, 18.5) |
| PEI = 3 | 23.5(23.1, 23.8) | 22.6(22.2, 23.0) | 22.1(21.7, 22.4) | 22.7(22.5, 22.9) |
| PEI = 4 | 24.4(24.0, 24.8) | 24.8(24.4, 25.1) | 23.9(23.5, 24.2) | 24.3(24.1, 24.6) |
| PEI = 5+ | 18.6(18.2, 19.0) | 19.3(19.0, 19.7) | 18.4(18.1, 18.8) | 18.8(18.6, 19.0) |