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Table 4 Outcome measure data from placebo control 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 2.35 0.94 8 0.50 0.76 7 0.00 0.16
 Post 10 1.35 1.00 8 0.63 0.74 7 0.57 1.27
Pain severity
 Worst 10 5.30 2.21 8 3.87 2.17 7 3.00 2.00 10 4.40 2.99 10 4.30 2.67 10 3.70 2.41
 At least 10 1.70 1.83 8 1.13 1.36 7 0.14 0.38 10 2.40 3.06 10 2.30 2.98 10 1.80 3.05
 Average 10 3.80 1.62 8 2.25 1.75 7 1.29 1.25 10 3.40 2.80 10 3.20 2.66 10 2.70 2.67
 Right now 10 2.80 1.99 8 1.50 1.07 7 1.57 2.23 10 3.00 3.37 10 2.70 3.37 10 2.10 2.89
 Index 10 3.4 2.28 8 2.19 1.89 7 1.50 1.86 10 3.30 3.03 10 3.1 2.92 10 2.6 2.75
WOMAC
 Pain 10 7.10 2.38 8 5.38 2.26 7 4.14 2.67 10 6.50 4.25 10 7.10 4.33 10 6.10 4.48
 Stiffness 10 3.00 0.94 8 3.00 1.51 7 2.00 1.16 10 3.60 1.65 10 3.50 1.96 10 2.70 1.89
 Physical Function 10 25.20 6.96 8 21.38 10.03 7 10.71 7.85 10 23.00 20.13 10 24.40 19.12 10 19.10 17.84
 Total 10 35.30 8.98 8 29.75 13.01 7 16.86 10.72 10 33.10 25.00 10 35.00 25.07 10 27.90 23.81
GROC Function 8 7.00 0.76 7 7.86 0.69 10 6.60 2.22 10 6.90 2.38 10 7.60 1.58
GROC Pain 8 6.50 1.07 7 7.71 1.50 10 6.30 2.14 10 6.80 2.30 10 7.20 1.93
Satisfaction 8 9.62 1.60 7 9.57 0.98 10 9.50 2.01 10 8.90 3.04 10 9.30 1.95
6MWT (m)
 Pre 10 321.97 88.53 8 393.37 92.82 7 428.95 90.15
 Post 10 317.77 89.80 8 379.44 80.30 6 433.05 100.56
Pressure pain threshold–mean of peripatellar sites (N)
 Most tender knee 10 51.89 36.27 7 60.29 25.01
 Least tender knee 10 52.70 28.57 7 73.98 62.05
Pressure pain threshold – standard site over tibialis anterior (N)
 Most tender knee 10 38.10 18.87 7 42.64 12.52
 Least tender knee 10 40.20 16.10 7 48.50 18.93
  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