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Table 3 General results of radiographic measurements

From: Reproducibility and sensitivity to change of various methods to measure joint space width in osteoarthritis of the hip: a double reading of three different radiographic views taken with a three-year interval

View Observer Reading n M0 M36 ΔM36–M0
     Mean (mm) SD Min Max Mean (mm) SD Min Max Mean (mm) SD Min Max
Pelvic 1 1 50 2.33 0.81 0.70 4.10 1.93 1.06 0.0 4.40 -0.40 0.65 -2.10 +0.80
   2 50 2.34 0.81 0.70 4.20 1.85 0.97 0.0 4.10 -0.49 0.54 -1.90 +0.40
  2 1 50 2.67 1.07 0.90 5.50 2.13 1.35 0.0 5.50 -0.54 0.66 -2.30 +0.40
   2 50 2.66 1.02 0.70 5.10 2.16 1.31 0.0 5.20 -0.49 0.67 -2.20 +0.20
  Mean (1 + 2) 1 50 2.50 0.91 0.70 4.65 2.03 1.17 0.0 4.95 -0.47 0.62 -2.05 +0.45
   2 50 2.50 0.89 0.70 4.50 2.01 1.11 0.0 4.55 -0.49 0.57 -2.05 +0.30
Hip AP 1 1 50 2.41 0.86 0.70 4.30 2.02 1.13 0.0 4.40 -0.39 0.61 -2.00 +0.60
   2 50 2.40 0.86 0.80 4.50 1.94 1.07 0.0 4.30 -0.46 0.59 -1.90 +0.70
  2 1 50 2.69 1.05 0.60 5.50 2.19 1.34 0.0 5.50 -0.49 0.66 -2.10 +0.50
   2 50 2.68 1.01 0.70 5.50 2.19 1.30 0.0 5.00 -0.49 0.66 -2.20 +0.60
  Mean (1 + 2) 1 50 2.55 0.94 0.65 4.90 2.11 1.22 0.0 4.95 -0.44 0.62 -2.05 +0.55
   2 50 2.54 0.92 0.75 5.00 2.06 1.17 0.0 4.55 -0.48 0.60 -1.95 +0.65
Oblique 1 1 50 2.37 0.79 0.70 3.70 1.92 1.05 0.0 3.80 -0.46 0.59 -2.20 +0.50
   2 50 2.29 0.78 0.40 3.60 1.92 1.02 0.0 4.10 -0.37 0.50 -1.70 +0.70
  2 1 50 2.69 1.00 0.50 5.00 2.21 1.28 0.0 5.00 -0.47 0.67 -2.40 +1.20
   2 50 2.70 1.01 0.60 5.00 2.18 1.27 0.0 5.00 -0.52 0.64 -2.30 +0.20
  Mean (1 + 2) 1 50 2.53 0.85 0.75 4.15 2.07 1.13 0.0 3.95 -0.46 0.61 -2.15 +0.65
   2 50 2.50 0.87 0.50 4.20 2.05 1.13 0.0 4.95 -0.45 0.53 -1.95 +0.35
  1. Shown are the general results of radiographic measurements of joint space width (JSW) at baseline (M0) and 36 months (M36), and the joint space change for the three views and two observers (and their mean and SD). AP, anteroposterior; Δ, difference; SD, standard deviation.