Table 1 Demographic characteristics of CHS and NEST subjects
|  | CHS (N = 799) | NEST (N = 592) | Pooled analysis (N = 1294)a |
|---|---|---|---|
n (%) | n (%) | n (%) | |
Sex | |||
 Male | 366 (45.8%) | 311 (52.5%) | 632 (48.8%) |
 Female | 433 (54.2%) | 281 (47.5%) | 662 (51.2%) |
Ethnicityb | |||
 Asian | 29 (3.6%) | – | – |
 Black | 23 (2.9%) | 299 (50.5%) | 322 (24.9%) |
 Hispanic | 308 (38.6%) | 58 (9.8%) | 366 (28.3%) |
 Non-Hispanic white | 394 (49.3%) | 212 (35.8%) | 606 (46.8%) |
 Other | 45 (5.6%) | 23 (3.9%) | – |
Highest parental education levelc | |||
 Less than 12th grade | 102 (12.8%) | 126 (21.3%) | 222 (17.2%) |
 Completed grade 12 | 153 (19.2%) | 162 (27.4%) | 298 (23.0%) |
 Some college or tech school | 352 (44.1%) | 159 (26.9%) | 483 (37.3%) |
 Completed 4 years of college or higher | 175 (21.9%) | 142 (24.0%) | 208 (16.1%) |
Maternal smoking during pregnancy | 217 (27.2%) | 303 (51.2%) | 500 (38.6%) |
Ever MD-diagnosed asthmad | 141 (17.7%) | – | – |
Ever wheezingd | 284 (35.5%) | – | – |
Wheezing in the previous 12 monthsd | 145 (18.2%) | – | – |
Bronchitic symptoms in the previous 12 monthsd | 118 (14.8%) | – | – |
Gestational age (weeks), mean ± SD | 39.6 ± 2.0 | 38.6 ± 2.2 | 39.2 ± 2.1 |
Maternal age at delivery (years), mean ± SD | 27.8 ± 5.9 | 27.7 ± 5.8 | 27.7 ± 5.8 |