| Mean age (SD), years | 52.87 (±8.61) | 52.13 (±8.70) | .009 | 52.86 (±8.56) | 51.9 (±8.73) | .011 |
| Organization of practice | | | <.001 | | | <.001 |
| Group | 996 (47.0) | 626 (38.8) | | 518 (47.1) | 356 (35.3) | |
| Independent (solo) | 458 (21.6) | 281 (17.4) | | 221 (20.1) | 181 (17.9) | |
| Other | 663 (31.4) | 706 (43.8) | | 360 (32.8) | 472 (46.8) | |
| Sex | | | <.001 | | | <.001 |
| Male | 1519 (71.8) | 995 (61.7) | | 782 (71.2) | 642 (63.6) | |
| Female | 598 (28.2) | 618 (38.3) | | 317 (28.8) | 367 (36.4) | |
| Examination result | | | <.001 | | | <.001 |
| Pass | 1886 (89.1) | 1354 (83.9) | | 990 (90.1) | 837 (83) | |
| Fail | 231 (10.9) | 259 (16.1) | | 109 (9.9) | 172 (17) | |
| Medical training | | | <.001 | | | <.001 |
| United States and Canada | 1942 (91.7) | 1330 (82.4) | | 1012 (92.1) | 821 (81.4) | |
| International | 175 (8.3) | 283 (17.5) | | 87 (7.9) | 188 (18.6) | |
| Degree | | | .001 | | | .010 |
| MD | 1933 (91.3) | 1521 (94.3) | | 1001 (91.1) | 949 (94.1) | |
| DO | 184 (8.7) | 92 (5.7) | | 98 (8.9) | 60 (5.9) | |
| Academic appointment | | | <.001 | | | <.001 |
| None | 1586 (74.9) | 1102 (68.3) | | 816 (74.2) | 677 (67.1) | |
| Yes, full-time | 30 (1.4) | 146 (9.1) | | 14 (1.3) | 98 (9.7) | |
| Yes, part-time | 501 (23.7) | 365 (22.6) | | 269 (24.5) | 234 (23.2) | |
| Any other certification held | | | .009 | | | .007 |
| Yes | 44 (2.1) | 56 (3.5) | | 21 (1.9) | 39 (3.9) | |
| No | 2073 (97.9) | 1557 (96.5) | | 1078 (98.1) | 970 (96.1) | |