TABLE III.

Muscle Degeneration Data by Tear Enlargement at Any Time During the Study Period

Variable	Tears with No Enlargement During Study Period (N = 51)	Tears with Enlargement During Study Period (N = 105)	P Value*
Progression of muscle degeneration (no.)			0.003
No progression	41 (80%)	60 (57%)
Progression	10 (20%)	45 (43%)
Patients with progression of muscle degeneration† (no.)			0.87
Infraspinatus only	3 (30%)	11 (24%)
Supraspinatus only	2 (20%)	12 (27%)
Both infraspinatus and supraspinatus	5 (50%)	22 (49%)

^*P value is for comparison of the proportion of patients in each group for tears that did not enlarge and those with tears that did enlarge by logistic regression with the following covariates: age at study enrollment, dominant study side, sex, and tear width at 1st visit as full-thickness tear.

^†Ten patients had progression of muscle degeneration with no enlargement, and 45 had tears with enlargement during study period.