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Table 7 Agreement (95% CI) between clinical observation and kinematic lumbopelvic segment movement characteristics and accuracy statistics of the kinematic variables for predicting the observed movement pattern

From: Kinematic characterization of clinically observed aberrant movement patterns in patients with non-specific low back pain: a cross-sectional study

Type Variable Diagram AUC %Agreement Kappa PABAK χ2 p value Sensitivity Specificity +LR -LR
aLPR CA_FP_PL@59 and Timing < 38% CA 0.73 74.55 0.47 (0.32–0.60) 0.49 (0.33–0.62) 38.33 <0.001 0.60 (0.52–0.67) 0.86 (0.79–0.91) 4.27 (2.49–7.62) 0.46 (0.36–0.61)
JUD LMin_PL ≥ 6 PP 0.85 85.93 0.50 (0.30–0.59) 0.73 (0.58–0.84) 40.55 <0.001 0.43 (0.30–0.49) 0.98 (0.94–0.99) 22.75 (5.44–143.44) 0.58 (0.51–0.74)
LSum_CA ≥ 15 CA 0.66 85.19 0.46 (0.26–0.51) 0.71 (0.55–0.82) 36.75 <0.001 0.37 (0.25–0.40) 0.99 (0.96–0.1.00) 38.5 (5.69–796.05) 0.64 (0.60–0.79)
  1. Typical (N = 108); Altered lumbopelvic rhythm (aLPR; N = 57); Judder (JUD; N = 30)
  2. AUC Area under the receiver operating characteristic curve, PABAK Prevalence-adjusted bias-adjusted kappa, +LR Positive likelihood ratio, −LR Negative likelihood ratio, CA Coupling-angle diagram, PP Phase-plane diagram, CA_FP_PL@59 and Timing < 38% Coupling angle of pelvis and lumbar spine at 59 degrees cut-off and 38% of movement in coupling angle reached 59 degrees for FP-PL, LMin_PL Number of local minimum occurrences (lumbar spine), LSum_CA Total number of local minimum and maximum occurrences (lumbopelvic coupling angle)