Table 1.
Descriptive Statistics and Alcohol, Tobacco, and Marijuana Onset Rates at Each Age Category
| Fathers | Boys | Girls | Children | |
|---|---|---|---|---|
| Total sample size (N) | 113 | 99 | 124 | 223 |
| Offspring sample size by age (n) | ||||
| Ages 9–10 years | 54 | 59 | 113 | |
| Ages 11–12 years | 85 | 108 | 193 | |
| Ages 13–14 years | 75 | 102 | 177 | |
| Ages 15–16 years | 64 | 80 | 144 | |
| Ages 17–18 years | 49 | 58 | 107 | |
| Onset rates at each age category: | ||||
| n who onset / n at-risk to onset (% who onset) | ||||
| Alcohol use: | ||||
| Prior to age 11 years | 16/107 (15%) | 0/56 (0%) | 0/68 (0%) | 0/124a (0%) |
| Ages 11–12 years | 19/96 (20%) | 1/90 (1%) | 2/116 (2%) | 3/206 (2%) |
| Ages 13–14 years | 27/80 (34%) | 14/79 (18%) | 7/100 (7%) | 21/179 (12%) |
| Ages 15–16 years | 31/52 (60%) | 24/55 (44%) | 21/73 (29%) | 45/127 (35%) |
| Ages 17–18 years | 16/27 (59%) | 15/27 (56%) | 15/37 (41%) | 30/64 (47%) |
| Tobacco use: | ||||
| Prior to age 11 years | 46/111 (41%) | 12/99 (12%) | 6/124 (5%) | 18/223 (8%) |
| Ages 11–12 years | 21/66 (32%) | 6/83 (7%) | 3/115 (3%) | 9/198 (5%) |
| Ages 13–14 years | 14/47 (30%) | 8/65 (12%) | 8/95 (8%) | 16/160 (10%) |
| Age 15–16 years | 9/35 (26%) | 15/42 (36%) | 14/65 (22%) | 29/107 (27%) |
| Ages 17–18 years | 7/28 (25%) | 8/19 (42%) | 12/34 (35%) | 20/53 (38%) |
| Marijuana use: | ||||
| Prior to age 11 years | 12/110 (11%) | 1/99 (1%) | 0/124 (0%) | 1/223 (.004%) |
| Ages 11–12 years | 9/100 (9%) | 10/94 (11%) | 3/121 (2%) | 13/215 (6%) |
| Ages 13–14 years | 14/92 (15%) | 11/70 (16%) | 21/100 (21%) | 32/170 (19%) |
| Ages 15–16 years | 17/78 (22%) | 18/43 (42%) | 15/59 (25%) | 33/102 (32%) |
| Ages 17–18 years | 19/63 (30%) | 3/18 (17%) | 11/33 (33%) | 14/50 (28%) |
a
The age 9–10 assessment wave was closed midway through the study for budgetary reason, thus precluding a determination of whether or not onset of a whole drink had occurred for the children who were not assessed until later; affected cases were treated as missing.