Table 1. Summary Statistics for Physician Specialties.*.
| Specialty | Physician-Years of Coverage | No. of Physicians | Physician Age | Coverage Years per Physician |
|---|---|---|---|---|
| no. | yr | no. | ||
| All physicians | 233,738 | 40,916 | 49.0±9.5 | 7.2±4.4 |
| Anesthesiology | 29,952 | 5,037 | 45.6±8.5 | 7.2±3.9 |
| Cardiology | 4,155 | 777 | 49.8±8.9 | 5.9±4.4 |
| Dermatology | 3,627 | 532 | 47.8±9.9 | 8.0±5.1 |
| Diagnostic radiology | 4,905 | 808 | 48.6±9.1 | 6.6±4.3 |
| Emergency medicine | 1,631 | 352 | 43.2±8.1 | 4.8±3.3 |
| Family general practice | 25,758 | 4,975 | 48.9±9.7 | 6.2±4.2 |
| Gastroenterology | 3,981 | 639 | 50.2±8.6 | 7.0±4.7 |
| General surgery | 7,352 | 1,205 | 48.9±9.4 | 7.2±4.5 |
| Gynecology | 2,577 | 459 | 53.0±9.1 | 5.8±3.9 |
| Internal medicine | 27,268 | 4,905 | 47.8±9.4 | 7.2±4.6 |
| Nephrology | 1,373 | 248 | 47.2±9.1 | 7.3±5.0 |
| Neurology | 3,037 | 519 | 48.4±8.4 | 6.6±4.8 |
| Neurosurgery | 1,927 | 351 | 48.6±8.2 | 5.1±3.2 |
| Obstetrics and gynecology | 10,385 | 1,899 | 47.5±9.0 | 6.2±3.5 |
| Oncology | 1,207 | 245 | 49.8±7.9 | 6.1±3.5 |
| Ophthalmology | 5,203 | 807 | 50.0±9.9 | 7.6±4.9 |
| Orthopedic surgery | 11,928 | 2,224 | 48.3±8.9 | 6.0±4.4 |
| Pathology | 20,717 | 3,094 | 51.8±9.6 | 9.5±4.3 |
| Pediatrics | 7,381 | 1,616 | 45.8±9.4 | 5.2±4.1 |
| Plastic surgery | 11,882 | 1,862 | 47.4±9.0 | 7.6±4.4 |
| Psychiatry | 19,011 | 3,011 | 52.5±8.7 | 6.6±3.5 |
| Pulmonary medicine | 2,362 | 380 | 47.5±8.2 | 7.7±5.0 |
| Thoracic–cardiovascular surgery | 3,187 | 437 | 50.6±9.1 | 8.7±4.6 |
| Urology | 2,328 | 368 | 51.9±9.3 | 7.3±4.9 |
| Other specialty | 20,604 | 4,166 | 47.3±9.7 | 5.4±4.0 |
*
Plus–minus values are means ±SD. All calculations were performed with the use of a database of physicians covered by a large, multistate liability insurer. The numbers of physician-years and physician observations are reported for all physicians between the ages of 30 and 70 years during the period from 1991 through 2005.