Table 1.
Characteristics of the Study Population in 2013 by Insurance Typea
| Characteristic | Insurance Typeb | P Valuec | |
|---|---|---|---|
| Commercial (n = 1 376 308) | Medicaid (n = 286 769) | ||
| Age, y | |||
| 18–34 | 505 628 (36.7) | 167 847 (58.5) | |
| 35–49 | 433 689 (31.5) | 70 173 (24.5) | <.001 |
| 50–64 | 436 991 (31.8) | 48 749 (17.0) | |
| Female sex | 702 165 (51.0) | 180 363 (62.9) | <.001 |
| Rural residence | 389 964 (28.3) | 120 232 (41.9) | <.001 |
| Charlson comorbidity index, mean (SD) | 0.29 (0.89) | 0.56 (1.32) | <.001 |
| Charlson comorbiditiesd | |||
| Myocardial infarction | 5597 (0.4) | 2482 (0.9) | <.001 |
| Congestive heart failure | 7539 (0.6) | 4760 (1.7) | <.001 |
| Peripheral vascular disease | 8032 (0.6) | 3756 (1.1) | <.001 |
| Cerebrovascular disease | 12 586 (0.9) | 5634 (2.0) | <.001 |
| Dementia | 210 (0) | 228 (0.1) | <.001 |
| Chronic pulmonary disease | 11 467 (0.8) | 3301 (1.1) | <.001 |
| Rheumatic disease | 3779 (0.3) | 2006 (0.7) | <.001 |
| Peptic ulcer disease | 24 317 (1.8) | 14 242 (5.0) | <.001 |
| Mild liver disease | 69 201 (5.0) | 22 394 (7.8) | <.001 |
| Diabetes mellitus | |||
| Without chronic complications | 104 807 (7.6) | 47 400 (16.5) | <.001 |
| With chronic complications | 15 857 (1.2) | 6515 (2.3) | <.001 |
| Hemiplegia or paraplegia | 2586 (0.2) | 2955 (1.0) | <.001 |
| Renal disease | 11 455 (0.8) | 4247 (1.5) | <.001 |
| Any malignant tumore | 31 820 (2.3) | 6621 (2.3) | .92 |
| Moderate or severe liver disease | 1251 (0.1) | 1553 (0.5) | <.001 |
| Metastatic solid tumor | 4989 (0.4) | 1652 (0.6) | <.001 |
a
The study sample includes nonpregnant, nondual eligible adults aged 18 to 64 years.
b
Data are presented as number (percentage) of patients unless otherwise indicated.
c
P values for differences between insurance types were calculated using χ2 tests for categorical variables and t tests for numeric variables.
d
Health conditions are Charlson comorbidity index conditions, created using the enhanced International Classification of Diseases, Ninth Revision (ICD-9) algorithm for administrative data. Variables indicate whether conditions were present at any time during 2012 or 2013.
e
Including lymphoma and leukemia and excluding malignant neoplasm of skin.