Clinic characteristics of clinics who did and did not record a country of birth in the OCHIN electronic health record
| Characteristic | Clinics who collect place of birth information | Clinics who do not collect place of birth information |
| Total no patients | 769 196 | 145 299 |
| Total no health systems | 116* | 121* |
| Mean patients per health system (SD) | 6631 (10 784) | 1201 (3920) |
| Total no clinics | 782 | 1029 |
| Mean patients per clinic (SD) | 984 (1751) | 141 (408) |
| Sex, N (column %) | ||
| Female | 457 067 (59.4) | 83 825 (57.7) |
| Male | 312 129 (40.6) | 61 474 (42.3) |
| Age at first study visit, N (column %) | ||
| 9–12 | 59 354 (7.7) | 16 165 (11.1) |
| 13–17 | 77 348 (10.1) | 20 962 (14.4) |
| 18–29 | 196 184 (25.5) | 31 512 (21.7) |
| 30–49 | 282 280 (36.7) | 47 671 (32.8) |
| 50–64 | 120 486 (15.7) | 21 908 (15.1) |
| 65 and over | 33 544 (4.4) | 7081 (4.9) |
| Federal poverty level, N (column %) | ||
| Always ≥138% | 60 250 (7.8) | 15 004 (10.3) |
| Always <138% | 486 544 (63.3) | 97 365 (67.0) |
| Above and below 138% | 84 743 (11.0) | 6920 (4.8) |
| Never reported | 137 659 (17.9) | 26 010 (17.9) |
| Insurance, N (column %) | ||
| Never insured | 174 263 (22.7) | 38 558 (26.5) |
| Some private insurance | 84 243 (11.0) | 22 154 (15.2) |
| Combined private and public | 67 073 (8.7) | 5741 (4.0) |
| Some public insurance | 443 617 (57.7) | 78 846 (54.3) |
| Preferred language, N (column %) | ||
| English | 297 286 (38.6) | 64 968 (44.7) |
| Spanish | 471 910 (61.4) | 80 331 (55.3) |
| Visits per year, N (column %) | ||
| <1 | 241 342 (31.4) | 29 030 (20.0) |
| (1, 3) | 253 677 (33.0) | 44 722 (30.8) |
| (3, 5) | 112 226 (14.6) | 23 169 (15.9) |
| 5+ | 161 951 (21.1) | 48 378 (33.3) |
| Black race, N (column %) | 26 677 (3.5) | 2147 (1.5) |
*There are 101 overlapping health systems between two columns.