Factor | Appendectomy | Prostatectomy | ||
---|---|---|---|---|
Proportional Change (95% CI) | P Value | Proportional Change (95% CI) | P Value | |
HHI | −0.344 | <  0.001 | 0.992 | <  0.001 |
(−0.517, − 0.237) | (0.407, 1.576) | |||
Hospital level | ||||
 Primary | 1[Reference] |  | 1[Reference] |  |
 Secondary | 0.260 | <  0.001 | 0.473 | 0.006 |
(0.166, 0.355) | (0.134, 0.812) | |||
 Tertiary | 0.594 | <  0.001 | 0.693 | <  0.001 |
(0.497, 0.691) | (0.354, 1.032) | |||
 Ungraded | 0.089 | 0.099 | 0.197 | 0.262 |
(−0.017, 0.196) | (−0.147, 0.542) | |||
HHI*Hospital level | ||||
 HHI*Primary hospital | 1[Reference] |  | 1[Reference] |  |
 HHI*Secondary hospital | 0.282 | 0.136 | −0.694 | 0.032 |
(−0.089, 0.652) | (−1.329, − 0.060) | |||
 HHI*Tertiary hospital | −0.051 | 0.783 | −0.990 | 0.002 |
(− 0.415, 0.313) | (−1.608, − 0.373) | |||
 HHI*Ungraded hospital | 0.287 | 0.161 | −0.309 | 0.352 |
(−0.114, 0.688) | (−0.961, 0.343) | |||
Control variablesa | Yes | Â | Yes | Â |