Table 1.
Unweighted Descriptive Statistics of the Pooled Data (n=64,772)
| Characteristic | Pooled | NLSY79 | ADDTH | NLSY97 | ECLS-K:1998 | ECLS-K:2011 |
|---|---|---|---|---|---|---|
| Birth cohorts, range | 1957–2006 | 1957–1965 | 1974–1984 | 1979–1985 | 1991–1994 | 2003–2006 |
| Sample size (% of pooled sample) | 64,772 (100) | 5,849 (9.03) | 18,414 (28.43) | 8,528 (13.17) | 18,995 (29.33) | 12,986 (20.05) |
| Study years, range | 1981–2016 | 1981–1994 | 1995–2007 | 1997–2014 | 1998–2007 | 2010–2016 |
| Number of waves | 43 | 10 | 4 | 16 | 6 | 7 |
| Mean follow-up, years | 8.74 | 9.22 | 10.65 | 14.00 | 6.50 | 5.66 |
| Characteristics at Initial Wave | ||||||
| Age range, years | 4–24 | 16–24 | 11–21 | 12–18 | 4–7 | 4–7 |
| Mean age (SD) | 10.66 (5.73) | 19.51 (2.24) | 15.7 (1.74) | 14.38 (1.49) | 5.14 (0.41) | 5.13 (0.41) |
| Mean BMI (SD) | 19.58 (4.82) | 23.02 (3.65) | 22.95 (4.77) | 22.09 (4.67) | 16.27 (2.19) | 16.43 (2.20) |
| Percentage obese (SD) | 11.63 (32.06) | 5.40 (22.61) | 12.12 (32.63) | 11.73 (32.17) | 11.56 (31.97) | 13.79 (34.48) |
| Percentage female | 49.40 | 50.95 | 50.41 | 47.97 | 49.03 | 48.75 |
| Percentage male | 50.60 | 49.05 | 49.59 | 52.03 | 50.97 | 51.25 |
| Percentage White | 64.52 | 80.63 | 61.57 | 53.90 | 67.12 | 64.60 |
| Percentage Black | 16.86 | 12.24 | 21.48 | 20.19 | 14.96 | 13.00 |
| Percentage Hispanic | 18.62 | 7.13 | 16.95 | 25.90 | 17.93 | 22.40 |
Note: Total of 718,560 person-years of data. Racial categories Whites and Black are non-Hispanics.
NLSY, National Longitudinal Survey of Youth 1979 and 1997; ADDTH, National Longitudinal Study of Adolescent Health; ECLS, Early Childhood Longitudinal Study-Kindergarten cohorts of 1998 and 2011.