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Table 1 Variables of interest used in the reliability (REL) and validity (VAL) studies

From: Reliability and validity of a novel Kinect-based software program for measuring posture, balance and side-bending

REL VAL Name Abbreviation Calculated in Qinematic™ Calculated in BTS-Elite Unit
Posture
 R C + D Posture -Head-Lateral deviation P-HL Position of the top of the head in relation to the line of gravity in the frontal plane Position of head marker in relation to midpoint between foot markers on Z-axis Cm
 R C + D Posture -Head-Frontal deviation P-HF Position of the top of the head in relation to the line of gravity in the sagittal plane Position of head marker in relation to midpoint between shoulder (?) markers on X-axis Cm
 R D Posture - Neck angle forward P-NA The Cervicothoracic Angle forward, is the angle between the spine line and the neck line. The spine line is from the mid-hip to the mid-shoulder and the neck line is from the mid-shoulder to the top of the head. A positive number indicate that the neck is positioned forward (anterior) in relation to the spine and a negative number indicate that the neck is positioned backwards (posterior) in relation to the spine Not calculated Deg
 R C + D Posture - Pelvic position P-PP Position of the mid-pelvic in relation to the line of gravity in the frontal plane Position of midpoint of the markers on the trochanter marker in relation to midpoint between the foot markers on Z-axis Cm
 R D Posture - Height loss P-HS Estimated loss of body height minus measured body height: Not calculated Cm
 R C + D Posture - Weight distribution P-WB Mean position of the Centre of mass in relation to the midpoint between ankle joints Mean position of the CoP in relation to the midpoint between foot markers %LEFT LEG
BALANCE- double stance (DS)
 R C + D Posture - Sway area DS-SA Sway area was calculated with Convex Hull-equation Sway area was calculated with Convex Hull-equation cm2
 R C + D Posture - Maximal Sway Velocity in anterior-posterior (AP) direction DS-SVAP Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) and the 95:th percentile was used as a maximum value cm/s
 R C + D Posture - Maximal Sway Velocity in medio-lateral (ML) direction DS-SVL Velocity of the sway in ML-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) and the 95:th percentile was used as a maximum value cm/s
BALANCE- Single stance LEFT (SSL)
 R C + D Balance -Sway area SSL-SA Sway area was calculated with Convex Hull-equation Sway area was calculated with Convex Hull-equation cm2
 R C + D Balance - Maximal Sway Velocity in anterior-posterior (AP) direction SSL-SVAP Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) and the 95:th percentile was used as a maximum value cm/s
 R C + D Balance - Maximal Sway Velocity in medio-lateral (ML) direction SSL-SVML Velocity of the sway in ML-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) and the 95:th percentile was used as a maximum value cm/s
Balance- Single stance RIGHT (SSR)
 R C + D Balance -Sway area SSR-SA Sway area was calculated with Convex Hull-equation Sway area was calculated with Convex Hull-equation cm2
 R C + D Balance - Maximal Sway Velocity in anterior-posterior (AP) direction SSR-SVAP Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) and the 95:th percentile was used as a maximum value cm/s
 R C + D Balance - Maximal Sway Velocity in medio-lateral (ML) direction SSR-SVML Velocity of the sway in ML-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) Velocity of the sway in AP-direction was calculated by (\( v=\frac{\Delta s}{\Delta t} \)) and the 95:th percentile was used as a maximum value cm/s
Side-bending
 R C + D Fingertips Left - distance to floor/body height SB-LF Minimal distance of the left fingertip to floor divided by estimated height Minimal distance to floor of marker on the left fingertip divided by self-reported height %Body height
 R C + D Fingertips Right - distance to floor/body height SB-RF Minimal distance of the right fingertip to floor divided by estimated height Minimal distance to floor of marker on the right fingertip divided by self-reported height %Body height
 R   Weight distribution Left SB-%BW Maximal position of the CoM to the left in relation to the midpoint between ankle joints Maximal position of the CoP to the left in relation to the midpoint between foot markers %
  1. C Construct validity D Discriminative validity. Abbreviations, ways of calculating the variables and units are presented