Skip to main content

Table 1 Baseline characteristics of study participants

From: Determining the feasibility of a trial to evaluate the effectiveness of phototherapy versus placebo at reducing pain during physical activity for people with knee osteoarthritis: a pilot randomized controlled trial 

Characteristics Aggregated (n = 20) Active phototherapy (n = 10) Placebo control (n = 10)
Age–years (mean, SD) 63.95 (9.27) 60.60 (10.35) 67.30 (7.01)
Sex
 Male (n, %) 7(35) 3(30) 4(40)
 Female (n, %) 13 (65) 7 (70) 6 (60)
Gender
 Man (n, %) 7 (35) 3 (30) 4 (40)
 Woman (n, %) 13 (65) 7 (70) 6 (60)
Annual household income (n, %)
 < $20,000 0 (0) 0 (0) 0 (0)
 $20,000 to $40,000 7 (35) 4 (40) 3 (30)
 $40,000 to $60,000 3 15) 1 (10) 2 (20)
 $60,000 to $80,000 2 (10) 1 (10) 1 (10)
 $80,000 to $100,000 2 (10) 2 (20) 0 (0)
 > $100,000 6 (30) 2 (20) 4 40)
Affected knee (n, %)
 Left 16 (80) 8 (80) 8 (80)
 Right 4 (20) 2 (20) 2 (20)
Knee pain duration–years (mean, SD) 7.38(9.25) 7.15 (10.21) 7.60 (8.74)
Number of other body regions with pain (mean, SD) 4.00 (2.68) 3.90 2.64) 4.10 (2.85)
NSAID usage in the past 3 months
 Yes (n, %) 7 (44) 3 (42.90) 4 (44.44)
 No (n, %) 9 (56) 4 (57.10) 5 (55.56)
Pain killer usage in the past three months
 Yes (n, %) 10 (63) 3 (42.90) 7 (77.78)
 No (n, %) 6 (37) 4 (57.10) 2 (22.22)
Number of comorbidities (median, IQR) 0.80 (1) 0.70 (1) 0.90 (1)
Comorbidities (n,%)
 Heart attack 1 (5) 0 (0) 1 (10)
 Asthma 3 15) 0 (0) 3 (30)
 Chronic obstructive pulmonary disease 1(5) 0 (0) 1 (10)
 Diabetes 7 35) 3 (30) 4 (40)
 Kidney problems secondary to diabetes 1 (5) 1 (10) 0 (0)
 Eye problems secondary to diabetes 1 (5) 1 (10) 0 (0)
 Poor kidney function 1 (5) 1 (10) 0 (0)
 Rheumatoid arthritis 2 (10) 1 (10) 1 (10)
  1. SD standard deviation, NSAID non-steroidal anti-inflammatory drug, IQR interquartile range