Table 1 Survey practices and sample physicians
| A: Number of survey practices and physicians by cohort | |||
|---|---|---|---|
| MRI acquisition year | Number of practices | Practices with >50 % physician ID match | Number of physicians |
| Comparison | |||
| Without MRI thru 2010 | 442 | 265 | 1790 |
| 2011-2013 | 23 | 19 | 220 |
| Total | 465 | 284 | 2010 |
| Treatment | |||
| 2007 | 30 | 21 | 276 |
| 2008 | 15 | 12 | 206 |
| 2009 | 18 | 16 | 283 |
| Total | 63 | 49 | 765 |