Table 3.

Service events per patient for high- and low-payment patients.

Service events	High-payment patients (n = 13,898)	Low-payment patients (n = 32,420)	P value
Physical therapy
Events per patient (median [IQR])	5 [1-10]	1 [1-4]	P < .001
Events per patient (average ± SD)	7.3 ± 8.7	2.9 ± 3.7
Knee brace
Events per patient (median [IQR])	1 [1-1]	1 [1-1]	P < .001
Events per patient (average ± SD)	1.1 ± 0.3	1.0 ± 0.2
NSAID
Events per patient (median [IQR])	1 [1-2]	1 [1-1]	P < .001
Events per patient (average ± SD)	1.5 ± 0.9	1.2 ± 0.5
Tramadol
Events per patient (median [IQR])	1 [1-1]	1 [1-1]	P < .001
Events per patient (average ± SD)	1.3 ± 0.7	1.1 ± 0.5
Opioid
Events per patient (median [IQR])	1 [1-2]	1 [1-1]	P < .001
Events per patient (average ± SD)	1.8 ± 1.6	1.3 ± 0.7
CS injection
Events per patient (median [IQR])	2 [1-3]	1 [1-2]	P < .001
Events per patient (average ± SD)	2.7 ± 2.2	1.6 ± 1.1
HA injection
Events per patient (median [IQR])	3 [2-5]	2 [1-3]	P < .001
Events per patient (average ± SD)	3.5 ± 2.8	2.4 ± 1.6
Arthroscopic debridement
Events per patient (median [IQR])	1 [1-1]	1 [1-1]	P = .320
Events per patient (average ± SD)	1.0 ± 0.2	1.0 ± 0.0
Radiography
Events per patient (median [IQR])	2 [2-3]	1 [1-2]	P < .001
Events per patient (average ± SD)	2.4 ± 1.3	1.6 ± 0.8
CT imaging
Events per patient (median [IQR])	1 [1-1]	1 [1-1]	P = .981
Events per patient (average ± SD)	1.0 ± 0.2	1.0 ± 0.2
MR imaging
Events per patient (median [IQR])	1 [1-1]	1 [1-1]	P < .001
Events per patient (average ± SD)	1.2 ± 0.4	1.0 ± 0.2
Evaluation and management
Events per patient (median [IQR])	5 [4-7]	2 [2-4]	P < .001
Events per patient (average ± SD)	5.9 ± 3.6	2.8 ± 2.0