TABLE 1.
Sample Characteristics for the Whole Sample and Stratified by Having or Not Having a Sibling by First Grade
| Variables | Total (n = 697) | Children With No Siblings Born by First Grade (n = 402) | Children With a Sibling Born by First Grade (n = 295) |
|---|---|---|---|
| Child sex, n (%) | |||
| Male | 330 (47.4) | 184 (45.8) | 146 (49.5) |
| Female | 367 (52.6) | 218 (54.2) | 149 (50.5) |
| Child race/ethnicity, n (%) | |||
| Non-Hispanic white | 559 (80.2) | 323 (80.4) | 236 (80.0) |
| Hispanic or not white | 138 (19.8) | 79 (19.7) | 59 (20.0) |
| Income-to-needs ratio when child aged 24 mo, M (SD) (n = 691) | 3.86 (2.89) | 3.71(2.62) | 4.08 (3.22) |
| Maternal education (years), M (SD) | 14.60 (2.42) | 14.59(2.42) | 14.66 (2.42) |
| Weight-for-length Z-ccore/BMIz, M (SD) | |||
| 15-mo | 0.25 (0.92) | 0.25 (0.94) | 0.25 (0.94) |
| 24-mo | 0.15 (0.90) | 0.20 (0.91) | 0.09 (0.89) |
| 36-mo | 0.15 (0.99) | 0.19 (1.01) | 0.10 (0.97) |
| 54-mo | 0.37 (0.99) | 0.41(1.00) | 0.31 (0.97) |
| 72-mo | 0.42 (1.08) | 0.52 (0.96) | 0.28 (1.24) |
Table shows means (M) and SD or counts (n) and percentages (%).