Table 1. Mean marijuana use days at baseline, 6-, 12-, 18-, and 24-month follow-ups based on trajectory group membership.
Assessment | Low (n=169, 28.2%) | Intermittent (n=97, 16.2%) | Moderate Decline (n=72, 12.0%) | High Decline (n=79, 13.2%) | Chronic (n=182, 30.4%) |
---|---|---|---|---|---|
Baseline Cannabis | 18.3 (25.1) | 34.8 (33.7) | 51.8 (32.9) | 60.9 (32.4) | 71.0 (29.5) |
6-month Cannabis | 2.2 (3.2) | 6.8 (8.1) | 41.7 (26.7) | 61.3 (32.6) | 71.8 (26.0) |
12-month Cannabis | 1.8 (3.5) | 16.0 (18.8) | 8.9 (11.5) | 64.0 (31.2) | 73.4 (27.1) |
18-month Cannabis | 3.2 (6.5) | 43.0 (34.8) | 6.4 (7.9) | 56.0 (33.9) | 73.0 (28.5) |
24-month Cannabis | 1.1 (2.2) | 53.1 (31.4) | 6.1 (9.8) | 6.9 (9.9) | 81.9 (16.3) |
Note: Values are Mean (SD). Because marijuana use was measured for the past 30 days at baseline, and the past 90 days at each follow-up, the value for baseline days was multiplied by 3 to standardize the days presented for descriptive purposes; n= 599 (baseline), n=512 (6-month), n=502 (12-month), n=505 (18-month) and n=512 (24 month).