Table 5.

Within-Group Comparison of OSS Scores^a

	Mean Difference (95% CI)	P
PRP group
Before treatment vs 1-mo follow-up	11.47 (6.65 to 16.28)	<.01
Before treatment vs 6-mo follow-up	18.86 (14.51 to 23.22)	<.01
1- vs 6-mo follow-up	7.40 (4.00 to 10.80)	<.01
Corticosteroid group
Before treatment vs 1-mo follow-up	11.13 (6.40 to 15.85)	<.01
Before treatment vs 6-mo follow-up	11.56 (6.63 to 16.49)	<.01
1- vs 6-mo follow-up	0.44 (–5.13 to 6.00)	.87

^a Bolded P values indicate statistical significance. OSS, Oxford Shoulder Score; PRP, platelet-rich plasma.