Skip to main content

Table 2 Aggregated outcome measure data (from active phototherapy intervention and placebo control groups) at all assessment time-points

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 

Measures Baseline (week 0) Visit 4 (week2) Visit 8 (week 4) 4-week follow-up (week 8) 8-week follow-up (week 12) 12-week follow-up (week 16)
N Mean SD N Mean SD N Mean SD N Mean SD N Mean SD N Mean SD
SPA (peak pain–baseline pain)
 Pre 20 2.17 1.18 16 0.81 0.75 15 0.60 1.24
 Post 20 1.33 1.15 16 0.56 0.81 15 0.53 1.13
Pain severity index
 Worst 20 4.75 2.15 16 3.37 2.27 15 3.00 1.81 19 3.11 2.73 18 3.17 2.77 19 3.11 2.75
 At least 20 1.70 1.63 16 0.69 1.07 15 0.20 0.41 19 1.37 2.45 18 1.39 2.42 19 1.16 2.36
 Average 20 3.55 1.50 16 1.81 1.47 15 1.20 1.01 19 2.42 2.36 18 2.17 2.36 19 2.00 2.33
 Right now 20 2.95 2.01 16 1.81 1.94 15 0.93 1.62 19 1.63 2.81 18 1.83 2.87 19 1.79 3.01
 Index 20 3.24 1.61 16 1.92 1.45 15 1.33 0.90 19 2.13 2.53 18 2.14 2.52 19 2.01 2.48
WOMAC
 Pain 20 6.30 2.34 16 4.31 2.44 15 3.60 2.35 19 4.58 3.77 18 5.00 4.11 19 4.53 4.03
 Stiffness 20 3.10 1.70 16 2.25 1.53 15 1.67 1.11 19 2.89 1.62 18 2.67 1.97 19 1.79 1.75
 Physical Function 20 22.95 9.72 16 15.81 10.52 15 9.913 6.81 19 17.32 16.66 18 17.83 16.99 19 13.63 14.79
 Total 20 32.35 12.00 16 22.38 13.63 15 14.40 9.32 19 24.79 21.11 18 25.50 22.49 19 19.95 20.14
GROC Function 16 7.19 1.05 15 8.27 1.44 19 7.42 2.01 18 7.78 2.16 19 8.32 1.67
GROC Pain 16 6.87 1.26 15 8.00 1.65 19 7.21 2.07 18 7.61 2.09 19 7.89 1.91
Satisfaction 16 10.25 1.29 15 10.33 0.76 19 9.84 1.97 18 9.56 2.50 19 9.84 1.74
6MWT (m)
 Pre 20 356.88 100.58 16 421.61 82.18 15 450.61 72.17
 Post 20 360.20 97.29 16 417.77 80.83 15 465.18 82.50
Pressure pain threshold–mean of eight peripatellar sites (N)
 Most painful knee 20 49.18 34.00 15 59.03 27.19
 Least painful knee 20 52.40 34.94 15 64.76 47.72
Pressure pain threshold – standard site over tibialis anterior (N)
 Most painful knee 20 42.68 28.68 15 47.37 25.02
 Least painful knee 20 43.73 27.08 15 56.27 23.44
  1. SPA sensitivity to physical activity, WOMAC Western Ontario and McMaster Universities Osteoarthritis Index, 6MWT 6-minute walk test, GROC global rating of change, N Newtons