TABLE 1.
Comparison of Dyads Included and Not Included in the Study
| Characteristics | Included (n = 330) | Not Included (n = 82) | P |
|---|---|---|---|
| Maternal/demographic | |||
| Race | .967 | ||
| White | 127 (38.4) | 33 (40.2) | |
| Hispanic | 74 (22.4) | 18 (22.0) | |
| Pacific Islander | 58 (17.6) | 13 (15.9) | |
| Asian | 45 (13.6) | 12 (14.6) | |
| Black | 17 (5.2) | 5 (6.1) | |
| American Indian | 9 (2.7) | 1 (1.2) | |
| Low SES (Hollingshead V) | 72 (21.8) | 21 (25.6) | .457 |
| Public insurance | 292 (88.5) | 77 (93.9) | .507 |
| No partner | 147 (44.6) | 38 (46.3) | .805 |
| Education <12 y | 137 (41.5) | 35 (42.7) | .803 |
| Maternal age, y | 25.2 ± 5.7) | 25.1 ± 5.2 | .945 |
| Prenatal MA use | 166 (50.3) | 38 (46.3) | .539 |
| MA heavy use (≥3 d/wk across pregnancy) | 29 (8.8) | 6 (7.3) | .588 |
| Prenatal alcohol use | 82 (24.9) | 24 (29.3) | .401 |
| Absolute alcohol/day (oz) across pregnancy | 0.06 ± 0.37 | 0.08 ± 0.24 | .757 |
| Prenatal marijuana use | 60 (18.2) | 16 (19.5) | .753 |
| Joints/day across pregnancy | 0.04 ± 0.18 | 0.26 ± 1.7 | .023 |
| Prenatal tobacco exposure | 179 (54.2) | 39 (47.6) | .323 |
| Cigarettes/d across pregnancy | 4.2 ± 7.1 | 4.5 ± 7.2 | .788 |
| Neonatal | |||
| Male gender | 170 (51.5) | 50 (61.0) | .139 |
| Birth weight, g | 3231 ± 606 | 3312 ± 570 | .276 |
| Gestational age, wk | 38.6 ± 2.1 | 39.0 ± 1.7 | .140 |
| Low birth weight | 41 (12.4) | 6 (7.3) | .245 |
| Length, cm | 50.3 ± 3.5 | 50.6 ± 2.9 | .477 |
| Head circumference, cm | 33.8 ± 1.8 | 34.2 ± 1.7 | .134 |
Data are presented as n (%) or mean ± SD.