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

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

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)
JUD	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)

Typical (N = 108); Altered lumbopelvic rhythm (aLPR; N = 57); Judder (JUD; N = 30)
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)

ISSN: 1471-2474