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