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Table 4 Spinal motion reliability and measurement error in the frontal and horizontal planes for LBP patients divided into subgroups

From: Reliability and measurement error of frontal and horizontal 3D spinal motion parameters in 219 patients with chronic low back pain

  Motion Parameter Statistical parameter Subgroups
Same ex. Different ex. BMI <30 BMI > 30 Pain (s) Pain (u) Male Female Grp. 1a Grp. 2,3,4a
  Number of subjects 89 130 146 73 161 58 87 132 148 71
Frontal plane: ROM lateral flexion ICC(1,1) 0.75 0.63 0.55 0.81 0.68 0.67 0.65 0.69 0.64 0.74
95 % CI [0.66-0.84] [0.53-0.73] [0.44-0.67] [0.74-0.89] [0.60-0.77] [0.53-0.81] [0.52-0.77] [0.6-0.78] [0.55-0.74] [0.64-0.85]
LOA_LL(degree) −14 −16.2 −17 −11.9 −14.1 −18.8 −15 −15.8 −16.4 −13.3
LOA_UL(degree) 12.2 17.1 16.6 12 14.5 16.9 14.4 15.8 15.9 13.7
Mean velocity lateral flexion ICC(1,1) 0.7 0.71 0.69 0.73 0.75 0.58 0.74 0.68 0.68 0.76
95 % CI [0.59-0.8] [0.63-0.8] [0.61-0.78] [0.62-0.84] [0.68-0.81] [0.4-0.75] [0.65-0.84] [0.58-0.77] [0.59-0.76] [0.66-0.86]
LOA_LL(ratio) −10.1 −9.3 −10.1 −8.9 −9.4 −10.3 −9 −10.1 −9.7 −9.6
LOA_UL(ratio) 7.6 8.9 9.1 7 7.8 10.1 7.8 8.8 8.7 7.8
Phase-plot Area lateral flexion ICC(1,1) 0.74 0.67 0.67 0.75 0.72 0.65 0.72 0.68 0.68 0.73
95 % CI [0.65-0.84] [0.58-0.77] [0.58-0.76] [0.65-0.85] [0.65-0.8] [0.5-0.8] [0.62-0.82] [0.59-0.77] [0.6-0.77] [0.63-0.84]
LOA_LL(ratio) −2265 −2381 −2472 −2127 −2253 −2679 −1982 −2598 −2358 −2398
LOA_UL(ratio) 1538 2460 2253 1641 1943 2375 1706 2269 2112 1961
Jerk index lateral flexion ICC(1,1) 0.73 0.73 0.75 0.69 0.74 0.69 0.80 0.60 0.76 0.61
95 % CI [0.63-0.82] [0.64-0.81] [0.67-0.81] [0.57-0.81] [0.67-0.81] [0.56-0.83] [0.73-0.88] [0.5-0.71] [0.69-0.83] [0.47-0.76]
LOA_LL(ratio) −6.5 −7.35 −7.28 −6.56 −6.19 −9.08 −7.27 −6.95 −7.39 −6.24
LOA_UL(ratio) 8.83 7.47 7.78 8.64 7.96 8.03 8.39 7.91 7.71 8.72
Horizontal plane: ROM rotation ICC(1,1) 0.69 0.28 0.36 0.56 0.44 0.41 0.45 0.43 0.35 0.63
95 % CI [0.57-0.8] [0.12-0.44] [0.21-0.5] [0.4-0.72] [0.32-0.57] [0.19-0.62] [0.28-0.61] [0.3-0.57] [0.21-0.49] [0.49-0.77]
LOA_LL(degree) −18.8 −29 −26.6 −22.8 −24.9 −26.3 −26.5 −24.6 −27.8 −19.3
LOA_UL(degree) 14.2 23.3 20.8 18.6 20.9 17.6 20.7 19.7 21.7 15.9
Mean velocity rotation ICC(1,1) 0.56 0.51 0.51 0.57 0.53 0.52 0.54 0.52 0.5 0.59
95 % CI [0.42-0.71] [0.38-0.63] [0.39-0.63] [0.41-0.72] [0.42-0.64] [0.33-0.71] [0.4-0.69] [0.39-0.64] [0.37-0.62] [0.44-0.74]
LOA_LL(ratio) −10.8 −12.4 −12.6 −10 −11.7 −12.3 −11.8 −11.9 −12 −11.3
LOA_UL(ratio) 7.4 9.6 9.3 7.5 8.8 8.8 9.1 8.6 8.6 9.2
Phase-plot Area rotation ICC(1,1) 0.68 0.4 0.45 0.6 0.47 0.57 0.50 0.5 0.45 0.6
95 % CI [0.57-0.79] [0.26-0.55] [0.32-0.58] [0.45-0.75] [0.35-0.59] [0.39-0.74] [0.34-0.66] [0.37-0.63] [0.32-0.58] [0.44-0.75]
LOA_LL(ratio) −1847 −2789 −2673 −1970 −2460 −2434 −2289 −2566 −2524 −2311
LOA_UL(ratio) 1254 2253 2014 1612 1989 1629 1760 1987 1863 1963
Jerk index rotation ICC(1,1) 0.58 0.58 0.65 0.37 0.59 0.53 0.66 0.44 0.6 0.49
95 % CI [0.44-0.72] [0.46-0.69] [0.55-0.74] [0.17-0.57] [0.49-0.69] [0.35-0.72] [0.54-0.78] [0.31-0.58] [0.5-0.7] [0.31-0.67]
LOA_LL(ratio) −7.8 −7.96 −7.99 −7.73 −7.92 −7.97 −9.09 −7.1 −8.33 −7.1
LOA_UL(ratio) 9.7 8.14 8.28 9.75 9.01 8.24 8.95 8.63 8.98 8.41
  1. BMI, body mass index; CI, confidence interval; ex., examiner(s); grp., group; ICC, intraclass correlation; LBP, low back pain; LL, lower limit; LOA, Bland-Altman limits of agreement; Pain (s), numerical rating scale maximum change ±1; Pain (u), numerical rating scale change ± 2 or more; ROM, range of motion; UL, upper limit
  2. Note: Maximum and minimum values in each row are in bold type
  3. a Quebec Task Force classifications 1 versus 2, 3 and 4