TABLE 2.
SDB Cluster Associations With Sample Characteristics
| Peak at 6 mo | Peak at 18 mo | Worst | Late | Normal | |
|---|---|---|---|---|---|
| N | 2142 | 1830 | 934 | 2005 | 4138 |
| Maternal | |||||
| Smoked during pregnancy, any, %*** | 24.6 | 26.6 | 30.0 | 23.8 | 17.5 |
| Alcohol during pregnancy, any, %* | 53.3 | 54.3 | 57.4 | 54.0 | 56.8 |
| Age at delivery, mean y (SD)*** | 28.28 (4.73) | 27.98 (4.90) | 27.73 (5.03) | 28.11 (4.79) | 29.04 (4.64) |
| Breastfed this child, ever, %*** | 75.6 | 74.8 | 70.4 | 75.1 | 79.3 |
| Child | |||||
| Gender, male, %*** | 54.0 | 53.5 | 55.9 | 49.6 | 49.2 |
| Race, white, %** | 98.2 | 96.7 | 97.7 | 98.1 | 98.2 |
| Premature, <37 wk, %* | 4.5 | 4.5 | 7.0 | 4.8 | 4.3 |
| Low birth weight, <2500 g, %** | 3.3 | 4.9 | 5.2 | 4.1 | 3.3 |
| Adenoids removed, ever, %*** | 4.6 | 6.3 | 31.7 | 9.8 | 3.1 |
| Tonsils removed, ever, %*** | 2.7 | 3.3 | 20.7 | 6.0 | 2.0 |
| IQ, <80, %*** | 11.4 | 14.0 | 15.6 | 14.8 | 9.6 |
| IQ, mean (SD)*** | 104.32 (16.14) | 103.3 (17.05) | 102.4 (16.25) | 102.7 (16.28) | 106.41 (16.07) |
| Socioeconomic and family | |||||
| Maternal education, lower, %*** | 65.3 | 66.0 | 68.3 | 66.4 | 56.9 |
| Paternal employment, manual, %*** | 43.7 | 46.4 | 47.2 | 44.4 | 37.7 |
| Housing, inadequate, %*** | 15.3 | 14.8 | 16.2 | 13.3 | 9.12 |
| Family adversity index, range of 0–18, mean (SD)*** | 2.15 (2.11) | 2.20 (2.09) | 2.37 (2.19) | 1.93 (2.00) | 1.57 (1.81) |
| HOME score, range of 0–8, mean (SD) | 5.7 (1.67) | 5.73 (1.64) | 5.70 (1.67) | 5.78 (1.64) | 5.79 (1.65) |
| Parity, ≥1, %** | 54.7 | 54.1 | 54.1 | 51.6 | 56.6 |
HOME, Home Observation for the Measurement of the Environment.
* P < .05; ** P < .01; *** P < .001.