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Table 1 Base-line characteristics of the patients

From: Treatment of myofascial pain syndrome with lidocaine injection and physical therapy, alone or in combination: a single blind, randomized, controlled clinical trial

Characteristics Physical therapy + local injection Physical therapy Local injection  
(n = 41) (n = 43) (n = 43) p
Sex (%)
 Female 35 (85.4) 36 (83.7) 33 (76.7) 0.55*
Age (Mean, SE) 37.2 (11.1) 42.6 (9.7) 37.7 (11.8) 0.081**
Residence (%)
 Medellín 32 (78.0) 35 (81.4) 35 (81.4)  
 Other municipalities 9 (22.0) 8 (18.6) 8 (18.6) 0.906*
Concomitant factors (%)
 Stress 34 (82.9) 29 (67.4) 30 (69.8) 0.227*
 Sleeplessness 24 (58.5) 18 (41.9) 23 (53.5) 0.290*
 Longer positions 27 (65.9) 34 (79.1) 29 (67.4) 0.342*
Muscles with trigger point (%)
 Trapezius muscle 37 (90.2) 42 (97.7) 39 (90.7) 0.326*
 Levator scapulae 31 (75.6) 27 (62.8) 26 (60.5) 0.290*
 Infraspinatus     
 muscle 12 (29.3) 12 (27.9) 13 (31.0) 0.953*
Physical examination (%)
 Alteration sensitive 8 (19.5) 7 (16.3) 8 (18.6) 0.924*
 Referred pain 22 (53.7) 36 (83.7) 23 (53.5) 0.004*
 Local twitch response 29 (70.7) 26 (61.9) 22 (51.2) 0.183*
Visual Analogue
 Scale for Pain (Mean, SD) 63.5 (13.9) 68.7 (17.0) 64.2 (16.2) 0.340**
 PHQ 9 (Mean, SD) 5.6 (3.2) 5.9 (4.2) 5.6 (3.5) 0.995 **
Quality of life SF-36 (Mean, SD)
 Bodily pain (BP) 38.8 (14.4) 35.2 (14.3) 38.5 (16.4) 0.642**
 Role-emotional (RE) 66.4 (35.0) 75.8 (38.7) 67.2 (36.8) 0.273**
 Role-physical (RP) 51.2 (40.0) 51.1 (37.7) 42.4 (37.6) 0.498**
 Physical functioning (PF) 79.5 (17.8) 72.5 (20.5) 81.7 (11.9) 0.095**
 Social function (SF) 69.5 (22.0) 68.0 (26.6) 71.8 (23.6) 0.799**
 General health (GH) 67.4 (18.3) 57.3 (21.9) 70.7 (15.4) 0.01**
 Mental health (MH 67.8 (14.2) 65.5 (18.9) 67.4 (17.5) 0.805**
 Vitality (VT) 54.2 (13.9) 54.7 (19.2) 60.7 (19.3) 0.181**
  1. *(Chi2)
  2. **Kruskal-Wallis
  3. Patient Health Questionnaire (PHQ-9), Items are scored from 0 (not at all) to 3 (nearly every day). Items are summed and the total score (from 0 to 27) represents the severity of depressive symptoms. Higher scores on the Visual Analogue Scale for Pain (VAS-P) indicate more pain, with a maximum of 100 (range, 0–100). Short Form Health Survey, the SF-36 with 8 sub-scales: BP bodily pain, RE role limitations as a result of emotional problems, RP role limitations as a result of physical problems, PF physical functioning, SF social functioning, GH general health perception, MH general mental health, VT vitality (the frequency of feeling full of energy vs feeling tired). Total sub-scale scores range from 0–100 with higher scores indicating better quality of life