Gestational age, wk | ||||||
---|---|---|---|---|---|---|
32–33 | 34–36 | 37 | 38–40 | ≥ 41 | All gestational ages | |
N | 936 | 4,665 | 4582 | 51,049 | 11,370 | 72,602 |
Male sex, % | 51.07 | 54.81 | 53.40 | 50.44 | 50.71 | 50.96 |
Race, %* | ||||||
White | 46.79 | 43.09 | 39.90 | 42.87 | 47.65 | 43.50 |
African-American | 11.32 | 10.40 | 9.41 | 8.57 | 9.30 | 8.89 |
Asian | 16.35 | 19.85 | 23.42 | 20.74 | 15.27 | 19.94 |
Hispanic | 16.99 | 18.93 | 20.32 | 21.25 | 20.81 | 20.92 |
Other/unknown | 8.55 | 7.74 | 6.96 | 6.56 | 6.97 | 6.75 |
Maternal age, y, % | ||||||
<18 | 2.24 | 1.29 | 1.18 | 1.19 | 1.49 | 1.25 |
18–34 | 67.20 | 68.75 | 70.76 | 73.58 | 74.64 | 73.17 |
>35 | 30.56 | 29.97 | 28.07 | 25.23 | 23.87 | 25.57 |
Family history of asthma, %† | ||||||
None | 93.91 | 94.23 | 94.43 | 94.82 | 95.15 | 94.80 |
Father only | 2.03 | 1.63 | 1.66 | 1.49 | 1.37 | 1.50 |
Mother only | 4.06 | 4.14 | 3.84 | 3.60 | 3.42 | 3.63 |
Both parents | 0.00 | 0.00 | 0.07 | 0.09 | 0.06 | 0.08 |
31 sibling <5 y of age in home, % | 42.95 | 42.17 | 39.57 | 39.51 | 32.22 | 38.58 |
Congenital anomaly present, %‡ | 13.14 | 10.33 | 7.77 | 6.52 | 6.24 | 6.88 |
Small for gestational age, %§ | 4.59 | 3.41 | 2.23 | 1.25 | 0.67 | 1.40 |
Oxygen exposure|| and BPD, %¶ | ||||||
No oxygen, no BPD | 55.77 | 86.13 | 96.49 | 97.77 | 96.31 | 96.17 |
<200 hours oxygen, no BPD | 37.50 | 12.24 | 3.12 | 1.95 | 3.26 | 3.35 |
3200 hours oxygen, no BPD | 5.24 | 1.29 | 0.37 | 0.25 | 0.40 | 0.41 |
BPD | 1.50 | 0.34 | 0.02 | 0.03 | 0.04 | 0.07 |
Unspecified respiratory hospitalization %# | 15.92 | 15.05 | 12.40 | 8.09 | 7.19 | 8.77 |
Laboratory-confirmed, medically attended RSV infection, %** | 3.95 | 2.98 | 2.14 | 1.64 | 1.36 | 1.74 |
Admitted to hospital, %‡‡ | 2.46 | 1.31 | 0.87 | 0.63 | 0.49 | 0.69 |
Treated as outpatient, %§§ | 1.50 | 1.67 | 1.27 | 1.00 | 0.87 | 1.05 |
Laboratory-confirmed, medically attended infection with other pathogen, %†† | 0.64 | 0.58 | 0.31 | 0.28 | 0.25 | 0.30 |
Admitted to hospital, %‡‡ | 0.53 | 0.28 | 0.13 | 0.13 | 0.11 | 0.14 |
Treated as outpatient, %§§ | 0.11 | 0.3 | 0.17 | 0.16 | 0.14 | 0.16 |