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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.