Table 1: Descriptive statistics of covariates for third siblings in three child families (n = 5,771).
a χ2 test (for binary variables)/t-test (for continuous variables - marked by*) show whether individuals who did not graduate from high school differ from individuals who did graduate high school
bp < 0.05
cHigher Socioeconomic Factor Index (SEFI) corresponds with lower SES
dHigher Grade 9 Achievement Index score corresponds with higher achievement
| Did not Graduate from High School (n = 561) | Graduated from High School (n = 5,210) | Difference | |
|---|---|---|---|
|
| |||
| Independent Variables | n (%)/Mean (SD) | n (%)/Mean (SD) |
χ2/ta |
| Older siblings' graduation status | |||
| Both siblings graduated from high school | 220 (39.22) | 4,561 (87.54) | 969.05b |
| Only oldest sibling graduated | 115 (20.50) | 251 (4.82) | |
| Only middle sibling graduated | 94 (16.76) | 290 (5.37) | |
| Neither sibling graduated | 132 (23.53) | 118 (2.26) | |
| Oldest siblings' sex | |||
| Male | 275 (49.02) | 2,724 (52.28) | 2.16 |
| Female | 286 (40.98) | 2,486 (47.72) | |
| Middle siblings' sex | |||
| Male | 284 (50.62) | 2,740 (52.59) | 0.79 |
| Female | 277 (49.38) | 2,470 (47.41) | |
| Youngest siblings sex | |||
| Male | 360 (64.17) | 2,626 (50.40) | 38.45b |
| Female | 201 (35.83) | 2,584 (49.60) | |
| Covariates | |||
| Socioeconomic Statusc of Neighborhood at Birth* | 0.43 (1.03) | -0.30 (0.92) | 16.00b |
| Location of Neighborhood at Age Birth | |||
| Urban | 326 (58.11) | 2,897 (55.60) | 55.31b |
| Rural South | 100 (17.83) | 1,445 (27.74) | |
| Rural Mid | 86 (15.33) | 684 (13.15) | |
| Rural North | 49 (8.73) | 183 (3.51) | |
| Socioeconomic Statuscof Neighborhood at 18* | 0.35 (0.99) | -0.30 (0.84) |
15.07b |
| Location of Neighborhood on 18th Birthday | |||
| Urban | 321 (57.22) | 2,847 (54.64) |
72.99b |
| Rural South | 99 (17.65) | 1,470 (28.21) | |
| Rural Mid | 95 (16.93) | 756 (14.51) | |
| Rural North | 46 (8.20) | 137 (2.63) | |
| Mother Unmarried at Time of Birth | 200 (35.65) | 499 (9.58) | 323.43b |
| Mother had first child before age 20 | 151 (26.92) | 311 (5.97) |
301.74b |
| Mental Health Diagnosis, 0 - 17 | 284 (50.62) | 1,624 (31.17) | 86.60b |
| Residential Mobility, 0 - 17 | 418 (74.51) | 2,847 (54.64) |
81.35b |
| Family Structure Change, 0 - 17 | 173 (30.84) | 861 (16.53) |
70.54b |
| Grade 9 Achievement Indexd * | -0.68 (0.47) | 0.36 (0.80) |
-45.95b |