TABLE II.

Patient Demographics and Length of Follow-up Compared with Muscle Degeneration

		Muscle Degeneration at Any Study Time Point
Variable Description	Entire Cohort (N = 156)	Absent (N = 86)	Present (N = 70)	P Value
Mean age (and standard deviation) (yr)
At time of study enrollment	63.2 (8.7)	61.0 (9.0)	65.8 (7.7)	0.0005*
At time of 1st visit as full-thickness tear	63.6 (8.5)	61.4 (8.7)	66.4 (7.5)	0.0002*
Study duration† (yr)
From study enrollment to most recent visit	6.0 (5.1)	5.9 (5.5)	6.2 (4.7)	0.14‡
From 1st visit as full-thickness tear to most recent visit	4.2 (5.4)	4.2 (5.1)	5.0 (5.2)	0.16‡
Sex§ (no.)				0.04#
Male	96 (62%)	59 (69%)	37 (53%)
Female	60 (38%)	27 (31%)	33 (47%)
Tear at 1st visit as full-thickness tear† (mm)
Width	10.0 (9.0)	10.0 (5.0)	13.0 (12.0)	0.0002‡
Length	11.0 (9.0)	10.0 (6.0)	13.0 (15.5)	0.0001‡
Tear enlargement during study period (no.)				0.007#
Yes	105 (67%)	50 (58%)	55 (79%)
No	51 (33%)	36 (42%)	15 (21%)
Time from tear enlargement to most recent follow-up† (yr)	2.0 (2.9)	1.9 (4.0)	2.2 (2.7)	0.22‡

^*P value is for the comparison of the absence and presence of muscle atrophy by the unpaired t test.

^†The values are given as the median, with the interquartile range (calculated as the 75th percentile minus the 25th percentile) in parentheses.

^‡P value is for the comparison of the absence and presence of muscle atrophy by the Wilcoxon 2-sample test.

^§The values are given as the number of subjects with usable measurements.

^#P value is for the comparison of the proportion of patients with and without muscle atrophy with the chi-square test.