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Table 3 Concurrent reliability and agreement estimates between the Captury and Vicon systems when measuring lower extremity point and peak kinematics in squats and standing broad jumps

From: Concurrent validity of lower extremity kinematics and jump characteristics captured in pre-school children by a markerless 3D motion capture system

Compared Values Agreement Reliability
LLoA MD ULoA Precision Span ICC(2,1) A [CI] ICC(2,1) C [CI]
Ankle Dorsi Flexion (°)
 Squats
  Maximum values −16.0 −3.5 8.9 ± 12.4e 0.69c [0.23;0.93] 0.74c [0.30;0.94]
  Minimum values −11.9 0.7 13.3 ± 12.6e 0.62c [0.06;0.92] 0.63c [0.07;0.93]
  Deepest position in squat −17.0 −2.0 13.0 ± 15.0f 0.68c [0.26;0.92] 0.70c [0.31;0.93]
  Midpoint in descent −3.5 3.5 10.5 ± 7.0e 0.75b [0.38;0.94] 0.85b [0.55;0.97]
 Jumps
  Maximum values −22.6 −8.2 6.2 ± 14.4f 0.38d [0.00;0.69] 0.58c [0.00;0.91]
  Minimum values −12.6 19.3 51.3 ± 31.9h 0.22d [0.00;0.51] 0.44d [0.00;0.84]
  Deepest position in landing −22.7 −5.7 11.3 ± 17.0f 0.62c [0.00;0.96] 0.69c [0.00;0.97]
  Landing Impact −15.1 5.5 26.1 ± 20.6g 0.70c [0.29;0.94] 0.76b [0.39;0.96]
Ankle Hip Separation Distance Ratio (ratio)
 Squats
  Maximum values −0.29 − 0.01 0.28 ± 0.29e 0.89b [0.72;0.97] 0.89b [0.72;0.97]
  Minimum values −0.29 − 0.01 0.28 ± 0.29e 0.86b [0.59;0.98] 0.88b [0.66;0.98]
  Deepest position in squat −0.27 0.01 0.30 ± 0.29e 0.89b [0.64;0.98] 0.89b [0.66;0.98]
  Midpoint in descent −0.27 0.01 0.30 ± 0.29e 0.91a [0.78;0.98] 0.92a [0.79;0.98]
 Jumps
  Maximum values −0.57 0.05 0.68 ± 0.62f 0.94a [0.82;0.99] 0.95a [0.86;0.99]
  Minimum values −0.31 0.04 0.38 ± 0.34e 0.73c [0.00;0.96] 0.74c [0.00;0.97]
  Deepest position in landing −0.41 0.07 0.55 ± 0.48e 0.89b [0.59;0.99] 0.90a [0.63;0.99]
  Landing Impact −0.43 0.05 0.53 ± 0.48e 0.95a [0.74;0.99] 0.95a [0.75;1.00]
Frontal Plane Knee Angle (°)
 Squats
  Maximum values −11.0 −0.6 9.7 ± 10.3e 0.88b [0.73;0.95] 0.87b [0.75;0.96]
  Minimum values −4.4 1.7 7.8 ± 6.1e 0.65c [0.11;0.94] 0.70c [0.14;0.96]
  Deepest position in squat −11.0 3.3 17.6 ± 14.3f 0.78b [0.50;0.94] 0.82b [0.56;0.95]
  Midpoint in descent −6.7 1.4 9.5 ± 8.1e 0.78b [0.34;0.95] 0.80b [0.38;0.97]
 Jumps
  Maximum values −19.6 −1.2 17.3 ± 18.5g 0.72c [0.06;0.98] 0.73c [0.06;0.99]
  Minimum values −7.2 2.1 11.4 ± 9.3e 0.81b [0.41;0.98] 0.84b [0.47;0.99]
  Deepest position in landing −18.7 −0.3 18.1 ± 18.4g 0.54c [0.01;0.89] 0.56c [0.01;0.90]
  Landing Impact −9.6 −0.1 9.4 ± 9.5e 0.80b [0.51;0.95] 0.81b [0.53;0.95]
Frontal Plane Knee Deviation (mm)
 Squats
  Maximum values −41.7 −8.6 24.6 ± 33.2e 0.90a [0.76;0.97] 0.92a [0.79;0.98]
  Minimum values −18.1 4.3 26.7 ± 22.4e 0.58c [0.14;0.87] 0.61c [0.15;0.88]
  Deepest position in squat −44.5 −0.8 42.9 ± 43.7f 0.89b [0.75;0.97] 0.90b [0.76;0.97]
  Midpoint in descent −25.5 3.5 32.5 ± 29.0e 0.85b [0.59;0.96] 0.86b [0.63;0.96]
 Jumps
  Maximum values −78.7 −13.7 51.4 ± 65.1g 0.47d [0.00;0.89] 0.51c [0.00;0.91]
  Minimum values −18.9 9.5 38.0 ± 28.4e 0.45d [0.04;0.82] 0.53c [0.06;0.87]
  Deepest position in landing −88.8 −3.4 82.0 ± 85.4h 0.45d [0.00;0.80] 0.46d [0.00;0.81]
  Landing Impact −37.7 −1.6 34.4 ± 36.0e 0.54c [0.01;0.80] 0.56c [0.01;0.82]
Frontal Plane Projection Angle (°)
 Squats
  Maximum values − 142.2 −42.4 57.3 ± 99.8h 0.52c [0.06;0.91] 0.63c [0.12;0.96]
  Minimum values −90.3 30.6 151.5 ±120.9h 0.35d [0.00;0.98] 0.38d [0.00;0.98]
  Deepest position in squat −170.1 −24.9 120.2 ±145.2h 0.57c [0.00;0.91] 0.61c [0.00;0.95]
  Midpoint in descent −16.3 1.5 19.2 ± 17.8g 0.84b [0.58;0.95] 0.85b [0.62;0.98]
 Jumps
  Maximum values −84.3 −12.0 60.3 ± 72.3h 0.62c [0.00;0.97] 0.66c [0.00;0.98]
  Minimum values −53.3 15.9 85.0 ± 69.2h 0.44d [0.03;0.99] 0.49c [0.05;1.00]
  Deepest position in landing −158.3 14.8 187.8 ±173.1h 0.37d [0.00;0.94] 0.39d [0.00;0.95]
  Landing Impact −47.9 −1.2 45.5 ± 46.7h 0.51c [0.00;0.83] 0.53c [0.00;0.86]
Hip Flexion (°)
 Squats
  Maximum values −34.4 2.5 39.5 ± 37.0h 0.51c [0.00;0.86] 0.53c [0.00;0.86]
  Minimum values −34.4 −5.8 22.7 ± 28.5h 0.47d [0.00;0.81] 0.54c [0.00;0.91]
  Deepest position in squat −32.1 3.9 40.0 ± 36.0h 0.49d [0.00;0.86] 0.51c [0.00;0.87]
  Midpoint in descent −29.8 0.7 31.2 ± 30.5h 0.60c [0.15;0.85] 0.61c [0.16;0.87]
 Jumps
  Maximum values −31.5 9.9 51.2 ± 41.4h 0.25d [0.00;0.62] 0.32d [0.00;0.74]
  Minimum values −26.6 −2.7 21.2 ± 23.9h 0.53c [0.00;0.89] 0.55c [0.00;0.90]
  Deepest position in landing −27.6 12.8 53.2 ± 40.4h 0.50d [0.08;0.80] 0.60c [0.10;0.91]
  Landing Impact −21.5 14.8 51.1 ± 36.3h 0.32d [0.00;0.68] 0.45d [0.00;0.86]
Knee Flexion (°)
 Squats
  Maximum values −23.6 −11.7 0.2 ± 11.9e 0.83b [0.63;0.94] 0.96a [0.89;0.99]
  Minimum values −27.9 −8.2 11.5 ± 19.7g 0.52c [0.10;0.79] 0.68c [0.12;0.94]
  Deepest position in squat −23.6 −11.7 0.2 ± 11.9e 0.83b [0.63;0.94] 0.96a [0.89;0.99]
  Midpoint in descent −11.5 −5.6 0.3 ± 5.9e 0.84b [0.64;0.94] 0.96a [0.89;0.99]
 Jumps
  Maximum values −25.7 −5.6 14.6 ± 20.1g 0.85b [0.63;0.96] 0.89b [0.68;0.97]
  Minimum values −23.2 −6.4 10.4 ± 16.8f 0.55c [0.15;0.81] 0.66c [0.21;0.90]
  Deepest position in landing −23.6 −7.2 9.3 ± 16.5f 0.91a [0.76;0.98] 0.94a [0.83;0.99]
  Landing Impact −25.8 −2.1 21.6 ± 23.7h 0.74c [0.15;0.96] 0.76b [0.15;0.97]
Knee Hip Separation Distance Ratio (ratio)
 Squats
  Maximum values −0.44 −0.03 0.38 ± 0.41e 0.93a [0.82;0.99] 0.93a [0.82;0.99]
  Minimum values −0.18 0.08 0.34 ± 0.26e 0.76b [0.53;0.94] 0.82b [0.62;0.96]
  Deepest position in squat −0.39 − 0.01 0.41 ± 0.40e 0.94a [0.86;0.99] 0.95a [0.86;0.99]
  Midpoint in descent −0.39 −0.01 0.41 ± 0.40e 0.88b [0.63;0.98] 0.89b [0.67;0.98]
 Jumps
  Maximum values −0.50 − 0.01 0.47 ± 0.48e 0.87b [0.63;0.97] 0.88b [0.64;0.97]
  Minimum values −0.26 0.07 0.41 ± 0.34e 0.69c [0.29;0.91] 0.73c [0.32;0.92]
  Deepest position in landing −0.39 0.05 0.48 ± 0.44e 0.86b [0.52;0.97] 0.87b [0.54;0.98]
  Landing Impact −0.35 0.06 0.47 ± 0.41e 0.89b [0.61;0.99] 0.90b [0.64;0.99]
Knee Varus (°)
 Squats
  Maximum values −27.6 −6.5 14.7 ± 21.1g 0.30d [0.00;0.66] 0.38d [0.00;0.73]
  Minimum values −19.5 −0.7 18.1 ± 18.8g 0.45d [0.00;0.78] 0.46d [0.00;0.80]
  Deepest position in squat −37.3 −8.0 21.2 ± 29.2h 0.29d [0.00;0.72] 0.34d [0.00;0.78]
  Midpoint in descent −37.4 −5.7 26.0 ± 31.7h 0.33d [0.00;0.70] 0.38d [0.00;0.81]
  1. Note:
  2. LLoA Lower Limits of Agreement, MD Mean Difference, ULoA Upper Limits of Agreement, ICC (2,1) A Intraclass Correlation of Absolute Agreement, ICC (2,1) C Intraclass Correlation of Consistency of Agreement, CI 95% Confidence Interval.
  3. Evaluation of intraclass correlation estimates: a Excellent; b Good; c Moderate; d Poor.
  4. Evaluation of precision span estimates: e Good; f Acceptable; g Questionable; h Invalid.