TABLE IV.

Summary of Area Treatment Rate Differential Estimates and Observed Treatment Rates Across Quintiles of Treatment-Specific Area Treatment Rate Differentials

	Treatment-Specific Area Treatment Rate Differential Quintile
Treatment	1	2	3	4	5
Surgery
Area treatment rate differential*	−0.10 (−0.21, 0.00)	−0.04 (−0.13, 0.06)	0.00 (−0.12, 0.13)	0.04 (−0.08, 0.16)	0.13 (−0.02, 0.43)
Treatment rate†	0.10 (0.08, 0.13)	0.16 (0.15, 0.17)	0.20 (0.19, 0.21)	0.24 (0.23, 0.25)	0.33 (0.29, 0.34)
Physical therapy
Area treatment rate differential*	−0.16 (−0.37, −0.01)	−0.07 (−0.20, 0.06)	−0.01 (−0.13, 0.12)	0.05 (−0.08, 0.20)	0.14 (−0.01, 0.33)
Treatment rate†	0.24 (0.22, 0.29)	0.33 (0.32, 0.35)	0.40 (0.39, 0.42)	0.47 (0.45, 0.49)	0.56 (0.53, 0.59)
Watchful waiting
Area treatment rate differential*	−0.11 (−0.28, 0.03)	−0.04 (−0.17, 0.09)	0.00 (−0.12, 0.11)	0.04 (−0.09, 0.18)	0.13 (−0.05, 0.34)
Treatment rate†	0.27 (0.24, 0.3)	0.35 (0.33, 0.36)	0.39 (0.37, 0.4)	0.43 (0.42, 0.44)	0.52 (0.48, 0.56)

^*The values are given as the mean, with the 95% CI in parentheses.

^†The values are given as the means, with the interquartile range in parentheses.