Table 1.
Descriptive statistics for the main predictors at each wave analyzed.
| Wave 2 | Wave 3 | Wave 4 | Wave 5 | Wave 6 | Wave 7 | |
|---|---|---|---|---|---|---|
| N | 670 | 653 | 627 | 437 | 517 | 433 |
| Age | 15.84 (0.61) | 16.78 (0.61) | 17.77 (0.61) | 20.01 (0.64) | 20.94 (0.64) | 22.02 (0.63) |
| Female (%) | 50.1% | 50.2% | 50.2% | 55.4% | 52.0% | 53.6% |
| African-American (%) | 78.1% | 79.0% | 78.5% | 81.0% | 78.5% | 78.5% |
| Marijuana (Female) | 1.81 (1.52) | 1.77 (1.52) | 2.01 (1.81) | 1.81 (1.66) | 1.68 (1.53) | 1.93 (1.75) |
| Marijuana (Male) | 2.02 (1.74) | 2.07 (1.84) | 2.25 (1.99) | 2.62 (2.28) | 2.55 (2.24) | 2.75 (2.31) |
| SES score (divide by 10) | 40.00 (10.42) | 40.10 (10.51) | 39.91 (10.38) | 40.14 (10.40) | 39.83 (10.18) | 39.64 (10.12) |
| Live w/ both parents | 32.4% | 32.6% | 33.3% | 33.9% | 32.7% | 35.6% |
| Friend drug use | 1.46 (0.44) | 1.68 (0.69) | 1.73 (0.71) | 1.67 (0.76) | 1.71 (0.75) | 1.79 (0.80) |
| Friend aggression | 2.05 (0.92) | 1.85 (0.83) | 1.80 (0.86) | 1.74 (0.83) | 1.73 (0.81) | 1.75 (0.80) |
| Maternal support | 3.98 (0.94) | 4.08 (0.93) | 4.01 (0.97) | 4.07 (0.98) | 4.05 (0.97) | 4.00 (1.00) |
| Paternal support | 2.90 (1.53) | 2.86 (1.64) | 2.68 (1.66) | 2.56 (1.62) | 2.60 (1.71) | 2.69 (1.65) |
|
| ||||||
| Wave 8 | Wave 9 | Wave 10 | Wave 11 | Wave 12 | Total | |
|
| ||||||
| N | 451 | 277 | 310 | 307 | 282 | 4964 |
| Age | 23.02 (0.65) | 29.26 (0.63) | 30.25 (0.62) | 31.23 (0.60) | 32.32 (0.62) | 21.84 (5.51) |
| Female (%) | 52.1% | 59.6% | 57.8% | 54.7% | 55.0% | 52.8% |
| African-American (%) | 79.6% | 72.2% | 74.8% | 75.9% | 78.0% | 78.1% |
| Marijuana (Female) | 1.85 (1.72) | 1.67 (1.59) | 1.91 (1.90) | 1.63 (1.56) | 1.53 (1.48) | 1.80 (1.64) |
| Marijuana (Male) | 2.78 (2.42) | 2.50 (2.30) | 2.08 (2.01) | 2.40 (2.26) | 2.31 (2.21) | 2.36 (2.12) |
| SES scorea | 39.98 (10.45) | 39.94 (10.37) | 39.82 (10.42) | 39.95 (10.30) | 39.69 (10.23) | 39.93 (10.34) |
| Live w/ both parentsa | 34.4% | 31.8% | 34.2% | 32.6% | 30.5% | 33.1% |
| Friend drug use | 1.74 (0.82) | 1.44 (0.54) | 1.49 (0.56) | 1.48 (0.56) | 1.48 (0.54) | 1.62 (0.68) |
| Friend aggression | 1.70 (0.83) | 1.48 (0.66) | 1.45 (0.53) | 1.53 (0.62) | 1.47 (0.57) | 1.74 (0.81) |
| Maternal support | 4.01 (1.00) | 4.00 (1.14) | 3.94 (1.16) | 3.89 (1.19) | 4.02 (1.15) | 4.01 (1.02) |
| Paternal support | 2.59 (1.70) | 2.46 (1.84) | 2.46 (1.89) | 2.38 (1.86) | 2.52 (1.92) | 2.65 (1.71) |
Note: Unless specified as a percentage, entries are mean (SD).
a
Measured during wave 1.