Table 1.
Descriptive Statistics for Dependent and Independent Variables
| Original Data |
Imputed Data |
||||
|---|---|---|---|---|---|
| Mean | S.D. | Range | Mean | S.D. | |
| Outcomes | |||||
| First sex | 25.7% | 0–1 | 25.7% | ||
| First pregnancy (female only) | 8.7% | 0–1 | 8.7% | ||
| First union formation | 2.4% | 0–1 | 2.4% | ||
| First residential independence | 3.9% | 0–1 | 3.9% | ||
| Lagged Outcomes (Wave I) | |||||
| Sex | 45.4% | 0–1 | 45.4% | ||
| Pregnancy (female only) | 8.8% | 0–1 | 8.8% | ||
| Union formation | 1.5% | 0–1 | 1.5% | ||
| Residential independence | 1.6% | 0–1 | 1.6% | ||
| Work | |||||
| Moderate (1 to 20 hours) | 38.3% | 0–1 | 38.3% | ||
| Intensive (21 or more hours) | 13.7% | 0–1 | 13.7% | ||
| Demographics | |||||
| Male | 50.0% | 0–1 | 50.0% | ||
| Race and ethnicity | |||||
| Black | 21.4% | 0–1 | 21.4% | ||
| Hispanic | 18.8% | 0–1 | 18.8% | ||
| Asian | 7.8% | 0–1 | 7.8% | ||
| Other race/ethnicity | 2.7% | 0–1 | 2.7% | ||
| Age | 16.2 | (1.04) | 15–21 | 16.2 | (1.04) |
| Physical development | |||||
| Interviewer-rated | 3.4 | (.82) | 1–5 | 3.4 | (.82) |
| Male self-reported | 3.2 | (.75) | 1–5 | 3.2 | (.74) |
| Female self-reported | 3.9 | (.73) | 1–5 | 3.9 | (.73) |
| Family Structure | |||||
| Adoptive or stepparent | 13.0% | 0–1 | 13.0% | ||
| Single-parent | 29.6% | 0–1 | 29.6% | ||
| Other family structure | 7.0% | 0–1 | 6.9% | ||
| Parents’ education | 4.7 | (1.64) | 1–7 | 4.7 | (1.64) |
| Household income | 3.5 | (.95) | −1.0–6.9 | 3.4 | (.95) |
| Dating | |||||
| Dated prior to Wave I | 32.6% | 0–1 | 32.6% | ||
| Dating at Wave I | 16.8% | 0–1 | 16.7% | ||
| Dating through Wave II | 23.0% | 0–1 | 23.0% | ||
| Expectation of marriage | 3.2 | (1.11) | 1–5 | 3.2 | (1.11) |
| Parents | |||||
| Parental decision-making | 1.7 | (1.53) | 0–7 | 1.7 | (1.53) |
| Attachment to parents | 4.6 | (.58) | 1–5 | 4.6 | (.59) |
| Parental supervision | 3.3 | (.89) | 1–5 | 3.3 | (.89) |
| Schooling | |||||
| Post-secondary at Wave II | 3.7% | 0–1 | 3.7% | ||
| Out of school at Wave II | |||||
| Suspended | 0.2% | 0–1 | 0.2% | ||
| Dropped out or expelled | 4.7% | 0–1 | 4.7% | ||
| Graduated | 4.6% | 0–1 | 4.6% | ||
| Other reason | 2.5% | 0–1 | 2.5% | ||
| Picture vocabulary test | 99.4 | (15.08) | 13–131 | 99.4 | (15.07) |
| Estimated grade point average | 2.7 | (.77) | 1–4 | 2.7 | (.77) |
| Educational aspirations | 4.4 | (1.08) | 1–5 | 4.4 | (1.09) |
| Trouble at school | 1.1 | (.80) | 0–4 | 1.1 | (.80) |
| Attachment to school | 3.7 | (.87) | 1–5 | 3.7 | (.88) |
| Delinquency and Peers | |||||
| Delinquency | −0.3 | (.90) | −1.0–2.1 | −0.3 | (.90) |
| Alcohol use | 1.2 | (1.50) | 0–6 | 1.2 | (1.50) |
| Marijuana use | 16.8% | 0–1 | 17.2% | ||
| Cigarette use | 22.5% | 0–1 | 22.4% | ||
| Hanging out with friends | 2.0 | (1.00) | 0–3 | 2.0 | (1.00) |
| Friends’ alcohol use | 1.2 | (1.18) | 0–3 | 1.2 | (1.18) |
| Friends’ marijuana use | 0.7 | (1.04) | 0–3 | 0.7 | (1.04) |
| N | 14,738 | 73,690 (5 data sets) | |||