Table 1.
Overall univariate crude doctor-diagnosed asthma incidence rates (IR) per 1000 person-years, by epidemiological characteristics*
| Characteristic | Level | N (%) | Person- years |
Number of cases of asthma |
IR (95% CI) Per 1000 |
|---|---|---|---|---|---|
| All subjects | - | 6283 | 65291 | 1798 | 27.5 (26.3, 28.8) |
| Calendar Time of Surveillance ** | 1980-1984 | 1225 (19.5%) | 2860 | 19 | 6.6 (4.0, 10.4) |
| 1985-1989 | 1884 (30.0%) | 6123 | 123 | 20.1 (16.7, 24.0) | |
| 1990-1994 | 1777 (28.3%) | 7690 | 178 | 23.1 (19.9, 26.8) | |
| 1995-1999 | 2494 (39.7%) | 8609 | 262 | 30.4 (26.9, 34.3) | |
| 2000-2004 | 3813 (60.7%) | 13056 | 357 | 27.3 (24.6, 30.3) | |
| 2005-2009 | 4628 (73.7%) | 16286 | 683 | 41.9 (38.9, 45.2) | |
| 2010-2014 | 2507 (39.9%) | 8761 | 152 | 17.3 (14.7, 20.3) | |
| 2015-2017 | 1204 (19.2%) | 1904 | 24 | 12.6 (8.1, 18.8) | |
| Decade Born | 1980-1989 | 2058 (32.6) | 33731 | 562 | 16.7 (15.3, 18.1) |
| 1990-1999 | 1098 (17.5) | 11169 | 390 | 34.9 (31.5, 38.6) | |
| 2000-2009 | 3127 (49.8) | 20391 | 846 | 41.5 (38.7, 44.4) | |
| Geographical Region | Northeast | 1535 (24.4%) | 13646 | 622 | 45.6 (42.1, 49.3) |
| Midwest | 3044 (48.5%) | 25404 | 706 | 27.8 (25.8, 29.9) | |
| Southwest | 1704 (27.1%) | 26240 | 470 | 17.9 (16.3, 19.6) | |
| Child Age during Follow-up** (yrs) | 0-4 | 6283 (100%) | 25520 | 1011 | 39.6 (37.2, 42.1) |
| 5-9 | 4365 (69.5%) | 17549 | 440 | 25.1 (22.8, 27.5) | |
| 10-14 | 2815 (44.8%) | 10471 | 188 | 18.0 (15.5, 20.7) | |
| 15-19 | 1649 (26.2%) | 5950 | 77 | 12.9 (10.2, 16.2) | |
| 20-35 | 712 (11.3%) | 5800 | 82 | 14.1 (11.2, 17.5) | |
| Child Race/Ethnicity | European American | 3268 (55.0) | 40184 | 829 | 20.6 (19.2, 22.1) |
| African American | 1515 (25.5) | 9813 | 504 | 51.4 (47.0, 56.0) | |
| Mexican American | 563 (9.5) | 7338 | 156 | 21.3 (18.1, 24.9) | |
| Caribbean American | 505 (8.5) | 3789 | 196 | 51.7 (44.7, 59.5) | |
| Other | 92 (1.5%) | 955 | 17 | 17.8 (10.4, 28.5) | |
| Child Sex | Male | 3172 (50.5) | 30901 | 984 | 31.8 (29.9, 33.9) |
| Female | 3110 (49.5) | 34389 | 814 | 23.7 (22.1, 25.4) | |
| Parental History of Asthma | None | 3401 (64.5) | 41344 | 725 | 17.5 (16.3 , 18.9) |
| Paternal only | 645 (12.2%) | 6308 | 239 | 37.9 (33.2 , 43.0) | |
| Maternal only | 1028 (19.5%) | 8342 | 422 | 50.6 (45.9 , 55.7) | |
| Both parents | 198 (3.8%) | 1248 | 106 | 84.9 (69.5, 102.7) | |
| Either or both parents | 2017 (37.2) | 16927 | 831 | 49.1 (45.8, 52.5) |
*
Child sex missing for one child, race/ethnicity missing for 432 children, parental history of asthma missing for 1,011 children.
**
the population numbers in these categories are not mutually exclusive; children in the cohorts are followed as they age over calendar time from the point of enrollment (birth date) until they are censored due to cessation of follow up or asthma diagnosis.