TABLE IV.

Ratio of Glenohumeral to Scapulothoracic Motion During Abduction in the Symptomatic Group

Abduction Angle	Visit 1		Visit 2		P Value‡
	Median* (Interquartile Range)	P Value†	Median* (Interquartile Range)	P Value†
0° to 30°	4.2 (1.8-6.8)	0.008§	2.5 (1.5-6.4)	0.20	0.13
30° to 60°	2.2 (1.2-3.8)		1.4 (0.6-4.7)		0.38
60° to 90°	2.0 (1.4-2.8)		2.1 (1.1-3.2)		0.23
0° to 90°	2.6 (1.7-4.0)		2.4 (1.9-3.8)		0.94

^*The 25th and 75th percentiles are given in parentheses.

^†P value for comparison of the values between different abduction segments within a visit is derived by mixed-model repeated-measures analysis of variance using rank-transformed data.

^‡P value, derived with the Wilcoxon signed-rank test, for the comparison of certain abduction segments between visits.

^§Post hoc analysis of this comparison by statistical contrasts showed p = 0.02 for 0° to 30° versus 30° to 60°, p = 0.001 for 0° to 30° versus 60° to 90°, p = 0.09 for 0° to 30° versus 0° to 90°, p = 0.41 for 30° to 60° versus 30° to 90°, and p = 0.38 for 30° to 60° versus 0° to 90°.