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Table 2 Segmental volume and thickness ratios in subscapularis, infraspinatus and deltoid muscle of the affected shoulder.

From: An MRI study on the relations between muscle atrophy, shoulder function and glenohumeral deformity in shoulders of children with obstetric brachial plexus injury

 

Subscapularis muscle

Infraspinatus muscle

Deltoid muscle

 

Mean

Range

Mean

Range

Mean

Range

Volume Ratio

50.7% ± 14.9%*

20.8% to 77.7%

61.4% ± 18.0%*

34.7% to 106.3%

76.3% ± 14.8%*

51.2% to 110.3%

Thickness Ratio

62.0% ± 16.0%**

28.3% to 87.5%

70.7% ± 17.1%**

45.0% to 106.7%

-

-

  1. Values are given as mean ± SD with their range. * Differences between subscapularis, infraspinatus and deltoid volume ratios was significant: p < 0.01. ** Difference between subscapularis and infraspinatus thickness ratios was significant: p < 0.05.