Demographic Characteristics of Study Sample by Selection Status (N = 34,849)
| Characteristic | Selected, No. (%)(n = 13,219) | Not Selected, No. (%)(n = 21,630) | P Valuea |
|---|---|---|---|
| Sex | .56 | ||
| Female | 7,639 (57.8) | 12,431 (57.5) | |
| Male | 5,580 (42.2) | 9,199 (42.5) | |
| Age-group, yb | <.001 | ||
| 19–29 | 3,529 (26.7) | 5,877 (27.2) | |
| 30–39 | 3,212 (24.3) | 4,831 (22.3) | |
| 40–49 | 3,300 (25.0) | 5,720 (26.4) | |
| 50–59 | 2,574 (19.5) | 4,209 (19.5) | |
| 60–64 | 604 (4.6) | 993 (4.6) | |
| Race/ethnicity | .004 | ||
| Hispanic, any race | 1,750 (13.2) | 2,579 (11.9) | |
| Non-Hispanic, white | 8,635 (65.3) | 14,295 (66.1) | |
| Non-Hispanic, other | 1,495 (11.3) | 2,519 (11.7) | |
| Unknown | 1,339 (10.1) | 2,237 (10.3) | |
| Average federal poverty levelc | .36 | ||
| <100% | 8,215 (62.2) | 13,564 (62.7) | |
| ≥100% | 3,598 (27.2) | 5,736 (26.5) | |
| Missing/unknown | 1,406 (10.6) | 2,330 (10.8) | |
| Number of chronic conditionsd | .25 | ||
| Missing/unknown | 4,240 (32.1) | 6,758 (31.2) | |
| 0 | 7,075 (53.5) | 11,547 (53.4) | |
| 1 | 1,128 (8.5) | 1,989 (9.2) | |
| 2 | 509 (3.9) | 859 (4.0) | |
| 3 | 221 (1.7) | 402 (1.9) | |
| 4 | 43 (0.3) | 69 (0.3) | |
| 5 | 3 (0.02) | 6 (0.03) |
Note: Oregon OCHIN patients selected to apply for health insurance coverage via Oregon Experiment compared with those patients not selected to apply.
↵a P values for χ2 test.
↵b Mean (SD) age was 39.3 (12.1) years for selected patients vs 39.4 (12.2) years for nonselected patients; 2-sided Wilcoxon rank sum test P =.50.
↵c Values ≥1,000% of the federal poverty level (seen in less than 1% of patients) were set to missing.
↵d Diagnosed before selection date; among asthma, coronary artery disease, diabetes, dyslipidemia, and hypertension. Missing/unknown indicates that patient had no preselection date encounters from which to assess chronic condition diagnoses.