Effectiveness of low-intensity laser on pain in patients with supraspinatus tendinopathy: A triple-blind randomized controlled trial

Table 4 Results of the repeated-measures Analysis of Variance for the Disability of Arm, Shoulder, and Hand scale, n (%)

Results	Pre	Post	Month	3 months	Time	Group	Time × group
					F (gL); P value; η2	F (gL); P value; η2	F (gL); P value; η2
Disability of Arm, Shoulder, and Hand scale					F (2.3; 90.8) = 35.36, P < 0.001, 2 = 0.473	F (1; 39) = 8.32, P = 0.006, 2 = 0.176	F (3; 117) = 10.74, P < 0.001, 2 = 0.216
Placebo	36.2 (12.9)	24.7 (12.8)	42.9 (14.0)	24.8 (11.9)
Laser	36.6 (13.3)	27.4 (13.8)	26.6 (11.0)	22.7 (13.1)

The values are expressed as the means (SD). F, P value, and η² correspond to the repeated-measures Analysis of Variance. Greenhouse-Geisser correction was applied when need.