Table 1.
Infant and Mother Characteristics
| Variable | Final Sample-Attended 18 and 30 months (N = 539) | Infants Attending 18 months only (n = 261) | P |
|---|---|---|---|
| Gestational age, M (SD) | 26 (2) | 26 (2) | .718 |
| Birthweight, M (SD) | 792 (130) | 787 (136) | .652 |
| Male, % (n) | 44 (239) | 45 (117) | .914 |
| Maternal Age, M (SD) | 28 (7) | 26 (7) | .004 |
| Maternal income, % (n) | |||
| ≥ $40,000 | 31 (165) | 23 (61) | .041 |
| $20,000−$39,999 | 26 (139) | 33 (85) | |
| < $20,000 | 44 (235) | 41 (106) | |
| Maternal education, % (n) | |||
| Some college | 47 (251) | 38 (100) | .096 |
| HS graduate | 28 (151) | 28 (73) | |
| < HS graduate | 25 (137) | 31 (81) | |
| IVH/PVL, % (n) | 14 (74) | 13 (34) | .809 |
| BPD, % (n) | 44 (239) | 51 (133) | .083 |
| NEC, % (n) | 8 (43) | 6 (16) | .345 |
| Late sepsis, % (n) | 39 (211) | 35 (92) | .301 |
| Early intervention by 18 months, % (n) | 58 (311) | 66 (173) | .012 |
| Bayley scores at 18 months, M (SD) | |||
| MDI | 81 (17) | 78 (16) | .110 |
| PDI | 86 (18) | 83 (16) | .044 |
| BRS total | 57 (31) | 42 (29) | < .001 |
| BRS Emotional Regulation | 57 (28) | 45 (28) | < .001 |
| BRS Motor Quality | 52 (35) | 41 (31) | < .001 |
| BRS Orientation/Engagement | 57 (30) | 47 (28) | < .001 |
Note: IVH = intraventricular hemorrhage; PVL = periventricular leukomalacia; BPD = bronchopulmonary dysplasia; NEC = necrotizing enterocolitis. All percentage categories sum to 100%.