Table 1.
Baseline characteristics of N-MAPSS youth randomized by age group, (n=900)
| Characteristic | Entire sample (n=11,048)N ( %) | Sub-sample (n=900) N ( %) | Group 1(10–12 year olds) (n= 115) N ( %) | Group 2 (13–15 year olds) (n= 357) N ( %) | Group 3(16–18 year olds) (n= 428) N ( %) |
|---|---|---|---|---|---|
| Mean age, years (SD) | 15.2 (2.1) | 15.1 (2.1) | 11.21 (0.8) | 14.11 (0.8) | 16.9 (0.8) |
| Sex, % female | 5,762 (52.2) | 469 (52.1) | 60 (52.2) | 159 (53.0) | 226 (52.8) |
| Race, % white | 4,715 (42.9) | 356 (39.8) | 37 (32.7) | 204 (57.1) | 173 (40.6)) |
|
Education Grade 3– 8 Grade 9–12 |
3,218 (29.2) 7,830 (70.0) |
253(28.1) 647 (71.9) |
115 (100.0) 0 (0.0) |
158 (44.3) 199 (55.7) |
1 (0.2) 427 (99.8) |
| Urbanicity | 5,256 (47.6) | 432 (48.0) | 55 (47.8) | 178 (49.9) | 206 (48.1) |
| Stimulant use (Past 30 days) | 1,371 (12.4) | 99 (11.0) | 12 (10.4) | 38 (10.6) | 63 (14.7) |
| Marijuana use (Lifetime) | 3,320 (29.1) | 263 (29.5) | 4 (3.5) | 69 (19.3) | 196 (45.8) |