Demographics of enrolees in 2010 and incident patients with idiopathic pulmonary fibrosis (IPF), overall and by subgroup
| Optum enrolees in 2010 | IPF cohort | |||
| Primary cohort incident patients | Broad case subgroup | Narrow case subgroup | ||
| Subjects n | 9 375 020 | 4206 | 2670 | 1685 |
| Age (mean) at diagnosis years | 41.7 | 53.4 | 52.7 | 53.6 |
| Age at diagnosis years | ||||
| 18–34 | 31.8 | 5.3 | 6.3 | 4.7 |
| 35–44 | 23.1 | 11.6 | 13.0 | 12.1 |
| 45–54 | 25.4 | 26.7 | 27.0 | 25.6 |
| 55–64 | 19.8 | 56.4 | 53.7 | 57.6 |
| Female | 51.6 | 50.6 | 51.7 | 52.7 |
| Census region | ||||
| New England | 17.9 | 18.2 | 16.9 | 17.6 |
| Middle Atlantic | 13.7 | 15.5 | 17.9 | 18.2 |
| South Atlantic | 20.7 | 23.1 | 23.9 | 24.7 |
| East South Central | 2.7 | 3.1 | 3.3 | 3.6 |
| West South Central | 14.9 | 15.9 | 15.7 | 14.1 |
| East North Central | 11.0 | 10.3 | 9.1 | 9.7 |
| West North Central | 8.0 | 5.0 | 4.6 | 4.3 |
| Mountain | 6.0 | 5.4 | 5.2 | 4.6 |
| Pacific | 5.2 | 3.3 | 3.5 | 3.2 |
| Other/unknown | 0.0 | 0.2 | 0.2 | 0.1 |
Data are presented as %, unless otherwise stated.