Table 1.
Demographics and Life Events by Study Wave
| Wave 1 | Wave 2 | Wave 3 | Wave 4 | |
|---|---|---|---|---|
| Demographics | ||||
| n | 4746 | 2516 | 2287 | 1830 |
| Age: mean years (SD) | 14.9 (1.7) | 19.4 (1.7) | 25.3 (1.6) | 31.1 (1.6) |
| Sex: n (%) | ||||
| Male | 2377 (50.2%) | 1130 (44.9%) | 1030 (45%) | 788 (43.1%) |
| Female | 2357 (49.8%) | 1386 (55.1%) | 1257 (55%) | 1042 (56.9%) |
| Ethnicity/Race: n(%) | ||||
| White | 2264 (47.7%) | 1525 (60.6%) | 1458 (63.8%) | 1241 (67.8%) |
| Black or African American | 887 (18.7%) | 274 (10.9%) | 212 (9.3%) | 154 (8.4%) |
| Hispanic | 352 (7.4%) | 142 (5.6%) | 124 (5.4%) | 84 (4.6%) |
| Asian | 896 (18.9%) | 447 (17.8%) | 373 (16.3%) | 268 (14.6%) |
| Other | 347 (7.3%) | 128 (5.1%) | 120 (5.2%) | 83 (4.5%) |
| Baseline SES: n(%) | ||||
| Low | 793 (17.4%) | 330 (13.4%) | 264 (11.8%) | 199 (11.1%) |
| Low-Middle | 857 (18.8%) | 413 (16.8%) | 357 (16%) | 266 (14.8%) |
| Middle | 1209 (26.6%) | 620 (25.3%) | 575 (25.8%) | 432 (24.1%) |
| High Middle | 1065 (23.4%) | 683 (27.8%) | 641 (28.7%) | 556 (31%) |
| High | 626 (13.8%) | 408 (16.6%) | 394 (17.7%) | 340 (19%) |
| MVPA | ||||
| Mean hours/week (SD) | 6.5 (4.8) | 5.4 (4.4) | 4.3 (3.9) | 4.3 (3.7) |
| Life Events | Wave 1 to 2 | Wave 2 to 3 | Wave 3 to 4 | |
| Marriage: n(%) | ||||
| Got Married | NAa | NA | 334 (25.6%) | 479 (36.5%) |
| Got Divorced | NA | NA | 24 (1.8%) | 33 (2.5%) |
| Stayed Married | NA | NA | 42 (3.2%) | 343 (26.2%) |
| Never Married | NA | NA | 907 (69.4%) | 456 (34.8%) |
| Children: n(%) | ||||
| Had First Child | NA | NA | 328 (17.5%) | 456 (28.8%) |
| Never Had Children | NA | NA | 1371 (73.2%) | 779 (49.2%) |
| Already had Children | NA | NA | 141 (7.5%) | 343 (21.6) |
| Lost Child? | NA | NA | 33 (1.8%) | 7 (0.4%) |
| Work (More than 20hrs per week): n(%) | ||||
| Began Working for Pay | NA | 944 (39.9%) | 690 (38.6% | 186 (13.4%) |
| Stopped Working for Pay | NA | 0 (0.0%) | 123 (6.9%) | 91 (6.6%) |
| Continued Working for Pay | NA | 165 (7.0%) | 740 (41.3%) | 1060 (76.6%) |
| Never Worked for Pay | NA | 1255 (53.1%) | 237 (13.2%) | 47 (3.4%) |
| Student Status: n(%) | ||||
| Out of School | NA | NA | 551 (31.0%) | 943 (57.1%) |
| Started School | NA | NA | 327 (18.4%) | 133 (8.1%) |
| Ended School | NA | NA | 632 (35.5%) | 469 (28.4%) |
| Stayed in School | NA | NA | 270 (15.2%) | 106 (6.4%) |
| Living With Parents: n(%) | ||||
| Continued to Live away from Parents | NA | NA | 564 (47.0%) | 1029 (67.5%) |
| Moved away from Parents’ House | NA | NA | 361 (30.1%) | 311 (20.4%) |
| Moved back in with Parents | NA | NA | 94 (7.8%) | 66 (4.3%) |
| Continued to Live with Parents | NA | NA | 181 (15.1%) | 119 (7.8%) |
a
Some life events cannot be assessed at early waves because the question was not asked on the surveys.