Table 1.
Characteristics of the study population
| Number of Subjects | % or mean (SD) | |
|---|---|---|
| Subjects | ||
| Boys | 671 | 48% |
| Girls | 726 | 52% |
| Age (years) | 1397 | 15.2 (0.6) |
| Height (cm) | 1397 | 166.1 (8.6) |
| Weight (lbs) | 1397 | 141.8 (35.0) |
| Race | ||
| Asian | 70 | 5% |
| African American | 30 | 2% |
| Caucasian | 594 | 43% |
| Mixed | 182 | 13% |
| Other | 338 | 24% |
| Unknown or missing | 183 | 13% |
| Ethnicity | ||
| Hispanic | 745 | 53% |
| Non-Hispanic | 585 | 42% |
| Unknown or missing | 67 | 5% |
| Forced Vital Capacity (mL) | 1345 | 4237 (851) |
| Forced Expiratory Volume (mL) | 1332 | 3673 (698) |
| Asthma | 1342 | 21% |
| Exposures | ||
| Distance to fwy (km) | 1397 | 1.4 (1.1) |
| Freeway NOx (ppb) | 1397 | 14.6 (16.5) |
| Non-freeway NOx (ppb) | 1397 | 4.8 (2.7) |
| Noise (dB) | 1397 | 72 (7.5) |
| Exposure to smoke | 1393 | 6% |
| Pets in home | 1317 | 58% |
| Housing Characteristics | ||
| Air conditioning use | 1333 | 72% |
| Home Built (year) | ||
| Before 1960 | 360 | 26% |
| 1960–1979 | 410 | 29% |
| 1980 or later | 296 | 21% |
| Unknown or missing | 331 | 24% |
| Communities | ||
| Anaheim | 136 | 10% |
| Glendora | 253 | 18% |
| Long Beach | 93 | 7% |
| Mira Loma | 190 | 14% |
| Riverside | 162 | 12% |
| Santa Barbara | 172 | 12% |
| San Dimas | 202 | 14% |
| Upland | 189 | 13% |