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

Table 3 Within-group pre-post comparison of clinical variables in each treatment group

Comparation	Placebo group	Intervention group
	Pre; post; P value	Pre; post; P value
VAS pre - VAS post	6.8 (1.3); 6.1 (1.3); < 0.001a	6.9 (1.5); 4.1 (1.6); < 0.001a
Strength pre - strength post	8.8 (3.4); 8.2 (2.9); 0.920	9.1 (3.5); 13.0 (3.4); < 0.001a
PPT pre - PPT post	4.7 (1.3); 5.6 (1.1); < 0.001a	4.4 (1.1); 5.9 (1.1); < 0.001a
Flexion pre - flexión post	155.6 (16.1); 158.9 (13.6); 0.169	154.5 (13.4); 168.4 (12.6); < 0.001a
Extension pre - Extension post	68.9 (11.3); 69.5 (10.0); 0.620	70.3 (13.6); 81.4 (9.4); < 0.001a
Aduction pre - aduction post	24.7 (6.6); 26.3 (4.9); 0.003a	22.9(5.1); 27.9(3.4); < 0.001a
Abduction pre - abduction post	118.9 (32.9); 127.8 (32.4); < 0.001a	116.9 (36.2); 163.3 (19.6); < 0.001a
Internal rotation pre - internal rotation post	66.5 (18.4); 66.9 (18.4); 0.763	60.9 (16.7); 74.4 (13.1); < 0.001a
External rotation pre - external rotation post	70.1 (16.7); 70.8 (18.0); 0.421	69.6 (16.4); 80.5 (12.7); < 0.001a

^aP < 0.05.

Comparison of the scores on variables measured in patients before and after the intervention according to the group to which they belong. P value (P), result of applying Student’s t-test for related samples or Wilcoxon’s signed-rank test for related samples, as appropriate. VAS: Visual analogue scale; PPT: Pressure pain threshold.