Table 1 Selected characteristics of participants with no history of physician‐diagnosed asthma at study entry.
| Selected characteristics at study entry* | N (2057) | Ratio of observed to total possible person‐years† |
|---|---|---|
| Age at entry (years) | ||
| 7–9 | 1441 | 0.80 |
| 10 | 557 | 0.79 |
| 11–12 | 59 | 0.67 |
| Race/ethnicity | ||
| Non‐Hispanic white | 1094 | 0.80 |
| Hispanic | 651 | 0.79 |
| African‐American | 110 | 0.70 |
| Asian | 101 | 0.86 |
| Mixed | 63 | 0.76 |
| Other/unknown | 38 | 0.60 |
| Gender | ||
| Female | 1095 | 0.80 |
| Male | 962 | 0.78 |
| Overweight at entry | ||
| No | 1778 | 0.79 |
| Yes | 279 | 0.77 |
| Parental history of asthma | ||
| No | 1651 | 0.80 |
| Yes | 273 | 0.79 |
| History of allergic rhinitis | ||
| No | 1688 | 0.79 |
| Yes | 322 | 0.78 |
| Humidifier use | ||
| No | 1470 | 0.80 |
| Yes | 497 | 0.77 |
| Maternal smoking during pregnancy | ||
| No | 1700 | 0.80 |
| Yes | 293 | 0.74 |
| Postnatal maternal smoking | ||
| No | 1830 | 0.80 |
| Yes | 189 | 0.74 |
| Household second hand smoking | ||
| No | 1658 | 0.80 |
| Yes | 357 | 0.76 |
| Pests in home | ||
| No | 1455 | 0.76 |
| Yes | 923 | 0.80 |
| Dogs in home | ||
| No | 923 | 0.79 |
| Yes | 1134 | 0.79 |
| Pets in home | ||
| No | 495 | 0.79 |
| Yes | 1562 | 0.79 |
| Health insurance | ||
| No | 358 | 0.78 |
| Yes | 1661 | 0.79 |
| Parental income (US$/year) | ||
| ⩽14 999 | 307 | 0.74 |
| 15 000–49 999 | 749 | 0.79 |
| >50 000 | 697 | 0.81 |
| Parental education | ||
| Less than high school | 295 | 0.77 |
| At least high school | 392 | 0.79 |
| Some college | 822 | 0.79 |
| College and above | 464 | 0.81 |
| Cohort | ||
| 1993 | 1046 | 0.80 |
| 1996 | 1011 | 0.78 |
*Numbers do not add up to 2057 because of missing data.
†Total possible years of observation was 8 years (4th–12th grades).