TABLE III.
Knee Arthroscopy Multivariable Regression Results*
| Probability of Selecting Ambulatory Surgery Center | Procedure Price Paid (Percent Difference) | Procedure Price Paid (Dollar Difference) | Probability of Ninety-Day Complication | |
| CalPERS × 2013 | 0.143† ± 0.0317 | −17.61† ± 4.850 | −1009† ± 261.0 | 0.00236 ± 0.00773 |
| CalPERS × 2012 | 0.0568‡ ± 0.0232 | −11.45‡ ± 4.926 | −633.6‡ ± 260.6 | −0.00509 ± 0.00588 |
| CalPERS × 2010 | 0.0219 ± 0.0264 | 3.978 ± 4.916 | 203.2 ± 247.7 | −0.00594 ± 0.00609 |
| CalPERS × 2009 | −0.0110 ± 0.0244 | 3.195 ± 4.159 | 163.8 ± 212.3 | −0.00125 ± 0.00690 |
| CalPERS | −0.0408§ ± 0.0217 | 3.586 ± 3.463 | 183.5 ± 177.1 | 0.00130 ± 0.00427 |
| 2013 | −0.0224 ± 0.0170 | 9.673† ± 2.833 | 481.0† ± 145.9 | 0.000442 ± 0.00210 |
| 2012 | −0.00322 ± 0.0113 | 3.677 ± 2.476 | 188.1 ± 127.9 | 0.00112 ± 0.00227 |
| 2011 | Reference | Reference | Reference | Reference |
| 2010 | −0.00767 ± 0.0118 | −5.486† ± 2.190 | −293.9† ± 111.9 | 0.00131 ± 0.00221 |
| 2009 | −0.0228 ± 0.0170 | −8.017† ± 2.814 | −435.3† ± 146.3 | 0.00173 ± 0.00222 |
| Male patients | 0.00507 ± 0.00587 | −0.0426 ± 0.945 | −2.219 ± 48.97 | 0.00373† ± 0.00143 |
| Charlson Comorbidity Index | −0.241† ± 0.0367 | 10.24‡ ± 4.061 | 507.6‡ ± 212.2 | 0.0202§ ± 0.0112 |
| Age in years | ||||
| 30 to 39 | −0.0164 ± 0.0117 | −14.07† ± 2.739 | −953.7† ± 175.3 | 0.00747‡ ± 0.00306 |
| 40 to 49 | −0.00101 ± 0.0154 | −24.95† ± 2.881 | −1692† ± 184.7 | 0.00421§ ± 0.00221 |
| 50 to 59 | 0.00646 ± 0.0166 | −30.94† ± 2.832 | −2098† ± 192.7 | 0.00275 ± 0.00203 |
| 60 to 64 | −0.00541 ± 0.0179 | −31.14† ± 2.845 | −2111† ± 187.6 | 0.00883† ± 0.00252 |
*
The values are given as the mean and the standard error based on 44,068 observations in each group.
†
Significant at p < 0.01.
‡
Significant at p < 0.05.
§
Not significant at p < 0.1.