Table 2 Comparison of PRP and corticosteroid groups during a 3-month follow-up.

From: Corticosteroids or platelet-rich plasma injections for rotator cuff tendinopathy: a randomized clinical trial study

Variables	Groups
	PRP				Corticosteroid				p value	Fisher value	Effect size
	Baseline	1st week	1st Month	3rd Month	Baseline	1st week	1st Month	3rd Month
VAS**	6.66 ± 2.26	5.36 ± 1.89	3.75 ± 2.15	3.08 ± 2.14	5.53 ± 1.80	4.86 ± 1.99	3.84 ± 2.07	3.88 ± 1.99	0.023	3.868	0.670
Flexion—degrees**	116.90 ± 37.58	118.40 ± 40.03	132.73 ± 39.06	139.50 ± 34.6	135.42 ± 35.70	139.42 ± 36.80	140.09 ± 36.98	148.65 ± 34.5	0.112	2.326	0.041
Extension—degrees**	35.16 ± 10.78	37.50 ± 10.40	46.16 ± 11.19	50.33 ± 9.18	41.42 ± 10.87	42.69 ± 13.05	50.76 ± 9.02	52.50 ± 8.15	0.302	1.220	0.022
Abduction—degrees**	102.83 ± 36.07	107.43 ± 37.19	115.66 ± 36.75	141.83 ± 36.04	118.46 ± 41.43	119.61 ± 41.10	127.50 ± 43.68	138.26 ± 40.24	0.081	2.572	0.045
Adduction—degrees**	20.50 ± 8.23	21.16 ± 8.37	26.50 ± 4.57	28 ± 3.61	23.21 ± 7.09	26.53 ± 6.28	27.69 ± 4.73	28.46 ± 4.18	0.011	5.087	0.086
Internal rotation—degrees**	64.26 ± 17.06	68.50 ± 17.12	78.50 ± 13.3	82.16 ± 10.39	60.17 ± 19.41	63.84 ± 22.64	77.50 ± 15.18	79.61 ± 13.55	0.741	0.333	0.006
External rotation—degrees**	59.66 ± 23.81	65.83 ± 23.12	74.83 ± 20.36	76.66 ± 18.30	57.14 ± 24.69	60.19 ± 26.81	64.03 ± 26.42	65.57 ± 26.39	0.036	3.475	0.060
WORC score**	32.85 ± 19.43		40.66 ±18.76	49.93 ± 22.36	35.56 ± 17.97		44.87 ± 21.59	48.46 ± 20.60	0.315	1.166	0.021
DASH score**	54.02 ± 18.24		48.83 ± 13.53	40.83 ± 18.19	52.50 ± 20.32		44.77 ± 17.89	41.05 ± 15.69	0.520	0.658	0.012
Supra-spinatus thickness—mm*	6.97 ± 1.46			6.36 ± 1.06	7.47 ± 1.38			7.40 ± 1.07	0.119	2.509	0.044

PRP platelet-rich plasma, VAS Visual Analogue Scale, WORC Western Ontario Rotator Cuff, DASH Disability of Arm-Hand-Shoulder, Effect size Eta squared
*p = 0.051, **p < 0.001, these two represent difference and changes during follow-up in the PRP and corticosteroid groups separately

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