Skip to main content

Table 5 Cross-sectional intraobserver reproducibility of joint space width measurements at baseline

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 JSW (mm; mean ± SD) Mean difference (mm; mean ± SD) Limits of agreements ICC values (95% CI)
   Reading 1 Reading 2    
Pelvic view 1 2.33 ± 0.81 2.34 ± 1.07 -0.01 ± -0.24 -0.49 to +0.47 0.96 (0.93–0.98), 0.99
  2 2.67 ± 0.81 2.66 ± 1.02 -0.02 ± 0.16 -0.30 to +0.34 (0.98–0.99) 0.98 (0.97–0.99)
  Mean (1 + 2) 2.50 ± 0.91 2.50 ± 0.89 0.004 ± 0.14 -0.28 to +0.28  
Hip AP 1 2.41 ± 0.86 2.40 ± 0.86 0.01 ± 0.25 -0.49 to +0.51 0.96 (0.93–0.98), 0.99
  2 2.69 ± 1.05 2.68 ± 1.01 0.01 ± 0.15 -0.29 to +0.31 (0.98–0.99) 0.98 (0.97–0.99)
  Mean (1 + 2) 2.55 ± 0.94 2.54 ± 0.92 0.01 ± 0.16 -0.30 to +0.32  
Oblique 1 2.37 ± 0.79 2.29 ± 0.78 0.08 ± 0.37 -0.89 to +0.71 0.88 (0.80–0.93), 0.98
  2 2.69 ± 0.78 2.70 ± 1.01 -0.02 ± 0.21 -0.41 to +0.51 (0.96–0.99) 0.96 (0.94–0.98)
  Mean (1 + 2) 2.53 ± 0.85 2.50 ± 0.87 0.03 ± 0.21 -0.29 to +0.35  
  1. Shown is the cross-sectional intraobserver reproducibility of radiographic measurements of joint space width (JSW) performed on baseline radiographs. CI, confidence interval; ICC, intraclass coefficient of correlation; SD, standard deviation.