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Table 4 Minimal Detectable Change (MDC), Intraclass Correlation Coefficient (ICC type 2.1), with 95% confidence intervals (95% CI) for the five lumbar motor control tests

From: Inter-examiner reproducibility of tests for lumbar motor control

Test MDC ICC (95% CI) Difference Average (SD) 95% LOA
1) Repositioning, RPS (all) 0.24 0.90 (0.81; 0.94) 0.02 (0.12) (-0.22; 0.26)
-> LBP = 0 0.85 (0.60; 0.95) 0.06 (0.13) (-0.19; 0.31)  
-> LBP = 1 0.92 (0.82; 0.96) 0.00 (0.12) (-0.23; 0.22)  
2) Sitting Forward Lean, SFL (all) 0.35 0.96 (0.92; 0.98) -0.06 (0.18) (-0.41; 0.29)
-> LBP = 0 0.94 (0.82; 0.98) -0.08 (0.18) (-0.43; 0.28)  
-> LBP = 1 0.96 (0.92; 0.98) -0.05 (0.18) (-0.40; 0.30)  
3) Sitting Knee Extension, SKE (all) 0.19 0.95 (0. 90; 0.97) -0.01 (0.10) (-0.20; 0.18)
-> LBP = 0 0.94 (0.84; 0.98) 0.00 (0.08) (-0.17; 0.16)  
-> LBP = 1 0.95 (0.88; 0.98) -0.02 (0.11) (-0.22; 0.19)  
4) Bent Knee Fall Out, BKFO (all) 0.37 0.94 (0.88; 0.97) -0.03 (0.19) (-0.40; 0.34)
-> LBP = 0 0.97 (0.92; 0.99) 0.01 (0.15) (-0.29; 0.31)  
-> LBP = 1 0.89 (0.77; 0.95) -0.06 (0.21) (-0.46; 0.35)  
5) Leg Lowering, LL (all) 2.90 0.98 (0.96; 0.99) -0.17 (1.49) (-3.08; 2.74)
-> LBP = 0 0.98 (0.92; 0.99) -0.75 (1.43) (-3.54; 2.05)  
-> LBP = 1 0.98 (0.96; 0.99) 0.18 (1.44) (-2.65; 3.00)  
  1. Average refers to the mean difference between the two examiners A and B in cm (for Leg Lowering in mm Hg) with standard deviation (SD). The 95% Limits Of Agreement (95% LOA) describes the interval in which 95% of the differences between examiner A and B are located. Values are given for all, and for the subsamples without (LBP = 0) and with Low Back Pain (LBP = 1) on day of examination.