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Table 1 Baseline characteristics of participants

From: Effects of intensity of electroacupuncture on chronic pain in patients with knee osteoarthritis: a randomized controlled trial

Variable Strong EA (n = 145) Weak EA (n = 72) Sham EA (n = 75)
Female, no. (%) 106 (73.1) 57 (79.2) 60 (80.0)
Age, mean (SD), years 64.6 (10.2) 63.7 (9.3) 61.9 (9.5)
Symptom duration, years (%)
 < 0.5 years 51 (35.2) 27 (37.5) 27 (36.0)
 0.5 to 3 years 60 (41.4) 27 (37.5) 23 (30.7)
 3 to 5 years 14 (9.7) 8 (11.1) 15 (20.0)
 ≥ 5 years 20 (13.8) 10 (13.9) 10 (13.3)
Height, mean (SD), m 1.62 (0.07) 1.62 (0.07) 1.64 (0.08)
Weight, mean (SD), kg 59.8 (7.8) 59.4 (7.5) 61.8 (8.5)
BMI, mean (SD) 22.67 (2.22) 22.46 (1.87) 22.93 (1.86)
Previous treatment, no. of patients (%)
 Physical therapy 25 (17.2) 11 (15.3) 12 (16.0)
 Corticosteroid injections 5 (3.5) 2 (2.8) 2 (2.7)
 Acupuncture 21 (14.5) 8 (10.8) 10 (13.3)
 Exercise 36 (24.8) 15 (20.3) 16 (21.3)
  1. BMI body mass index