Table 1.
Summary statistics of the individual characteristics of the physician sample
| Primary care | Cardiology | Total | |
|---|---|---|---|
| Female | 0.495 | 0.177 | 0.387 |
| Age, y | |||
| ≤39 | 0.346 | 0.208 | 0.299 |
| 40–49 | 0.261 | 0.458 | 0.327 |
| 50–59 | 0.250 | 0.156 | 0.218 |
| ≥60 | 0.144 | 0.177 | 0.155 |
| Region | |||
| Northeast | 0.468 | 0.292 | 0.408 |
| Midwest | 0.239 | 0.240 | 0.239 |
| South | 0.074 | 0.354 | 0.169 |
| West | 0.218 | 0.115 | 0.183 |
| Practice type | |||
| Hospital | 0.755 | 0.750 | 0.754 |
| Private | 0.245 | 0.250 | 0.246 |
| Practice size | |||
| ≤35 | 0.176 | 0.115 | 0.155 |
| 36–100 | 0.356 | 0.271 | 0.327 |
| 101–350 | 0.207 | 0.062 | 0.158 |
| 350–1,600 | 0.261 | 0.552 | 0.359 |
| Observations | 188 | 96 | 284 |
Fraction of subjects. Primary care includes internal medicine and family medicine. Regions according to the US Census Bureau census regions: Northeast (census region I), Midwest (census region II), South (census region III), and West (census region IV).