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Table 3 Outcome measure data from active phototherapy intervention group 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 10 2.00 1.41 8 0.75 0.89 8 0.50 1.07
 Post 10 1.30 1.34 8 0.50 0.93 8 0.38 1.06
Pain severity
 Worst 10 4.20 2.04 8 2.88 2.42 8 3.00 1.77 9 1.67 1.50 8 1.75 2.32 9 2.44 3.09
 At least 10 1.70 1.49 8 0.25 0.46 8 0.25 0.46 9 0.22 0.44 8 0.25 0.46 9 0.44 1.01
 Average 10 3.30 1.42 8 1.38 1.06 8 1.13 0.84 9 1.33 1.12 8 0.88 0.99 9 1.22 1.72
 Right now 10 3.10 2.13 8 2.13 2.59 8 0.38 0.52 9 0.11 0.33 8 0.75 1.75 9 0.44 3.28
 Index 10 3.08 1.95 8 1.66 2.03 8 1.88 1.49 9 0.83 1.16 8 0.91 1.57 9 1.39 2.46
WOMAC
 Pain 10 5.50 2.12 8 3.25 2.25 8 3.13 2.10 9 2.44 1.42 8 2.38 1.69 9 2.78 2.73
 Stiffness 10 3.20 1.75 8 1.50 1.20 8 1.38 1.06 9 2.11 1.27 8 1.62 1.51 9 0.78 0.83
 Physical Function 10 20.70 11.82 8 10.25 7.36 8 7.75 5.95 9 11.00 9.15 8 9.63 9.61 9 7.56 7.47
 Total 10 29.40 14.29 8 15.00 10.23 8 12.25 8.01 9 15.56 10.85 8 13.63 11.43 9 11.11 10.42
GROC Function 8 7.38 1.30 8 8.63 1.85 9 8.33 1.32 8 8.87 1.25 9 9.11 1.45
GROC Pain 8 7.25 1.39 8 8.25 1.83 9 8.22 1.39 8 8.63 1.30 9 8.67 1.66
Satisfaction 8 10.88 0.35 8 11.00 0.00 9 10.22 1.99 8 10.38 1.41 9 10.44 1.33
6MWT (m)
 Pre 10 391.78 103.98 8 449.85 63.53 8 469.57 50.71
 Post 10 402.62 88.99 8 456.09 64.78 8 489.27 62.21
Pressure pain threshold–mean of periopaterllar sites (N)
 Most painful knee 10 46.49 31.46 8 57.68 29.82
 Least painful knee 10 52.09 40.40 8 56.70 27.91
Pressure pain threshold–standard site over tibialis anterior (N)
 Most painful knee 10 47.7 35.83 8 53.38 25.52
 Least painful knnee 10 47.25 34.92 8 49.56 26.77
  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