Table 1.
Variable | n | Estimated percentage of cannabis initiation 11–17 years | ERR | [95% CI] | p | AERR | [95% CI] | p |
Parental monitoring Birth weight | 638 | 34.8% | 0.94 | [0.93, 0.97] | <.001 | 0.96 | [0.93, 0.98] | <.001 |
Low | 361 | 34.1% | 0.95 | [0.77, 1.18] | .661 | 0.86 | [0.70, 1.05] | .132 |
Normal | 277 | 35.7% | ref. | ref. | ||||
Community | ||||||||
Urban | 331 | 34.4% | 0.98 | [0.79, 1.21] | .845 | 1.01 | [0.75, 1.37] | .925 |
Suburban | 307 | 35.2% | ref. | ref. | ||||
Race | ||||||||
Black | 291 | 32.3% | 0.88 | [0.71, 1.09] | .229 | 0.64 | [0.47, 0.86] | .003 |
White | 347 | 36.9% | ref. | ref. | ||||
Sex | ||||||||
Male | 296 | 41.6% | 1.44 | [1.16, 1.78] | .001 | 1.24 | [0.99, 1.54] | .056 |
Female | 342 | 29.0% | ref. | ref. | ||||
Externalizing at age 11 | 638 | 34.8% | 1.02 | [1.01, 1.03] | .001 | 1.01 | [1.00, 1.02] | .160 |
Smoked tobacco by age 11 | ||||||||
Yes | 63 | 63.5% | 2.01 | [1.61,2.51] | <.001 | 1.31 | [1.02, 1.69] | .037 |
No | 575 | 31.6% | ref. | ref. | ||||
Drank alcohol by age 11 | ||||||||
Yes | 63 | 54.0% | 1.65 | [1.28,2.13] | .001 | 0.96 | [0.71, 1.30] | .784 |
No | 575 | 32.7% | ref. | ref. | ||||
Had a friend who smoked tobacco at age 11 | ||||||||
Yes | 180 | 52.8% | 1.90 | [1.55,2.33] | <.001 | 1.59 | [1.28, 1.98] | <.001 |
No | 458 | 27.7% | ref. | ref. | ||||
Had a friend who drank alcohol at age 11 | ||||||||
Yes | 124 | 50.0% | 1.61 | [1.29,2.00] | <.001 | 1.25 | [0.99, 1.57] | .061 |
No | 514 | 31.1% | ref. | ref. | ||||
Maternal education | ||||||||
<High school | 99 | 37.4% | ref. | ref. | ||||
High school | 169 | 37.3% | 1.00 | [0.72, 1.38] | .988 | 1.18 | [0.86, 1.61] | .309 |
Some college | 246 | 33.7% | 0.90 | [0.66, 1.23] | .517 | 1.07 | [0.79, 1.44] | .673 |
College | 124 | 31.4% | 0.84 | [0.58, 1.21] | .353 | 1.38 | [0.94,2.01] | .100 |
Maternal marital status | ||||||||
Single | 208 | 42.3% | 1.36 | [1.10, 1.68] | .005 | 1.60 | [1.25,2.05] | <.001 |
Married | 430 | 31.2% | ref. | ref. | ||||
Maternal tobacco smoking at baseline | ||||||||
Smoker | 233 | 45.9% | 1.62 | [1.31, 1.99] | <.001 | 1.52 | [1.23, 1.88] | <.001 |
Nonsmoker | 405 | 28.4% | ref. | ref. |
Notes: ERR = estimated relative risk; CI = confidence interval; AERR = adjusted ERR; ref. = reference.