Table 2 CPAK measurements (Mean ± SD) and comparisons between observers, and between LLR_mean and both navigation data wear assumptions

Measurements

LLR₁

87.8 ± 3.1

86.8 ± 2.3

174.5 ± 3.3

1 ± 4.3

LLR₂

87.4 ± 3.1

86.8 ± 2.1

174.2 ± 3.3

0.6 ± 4.2

LLR_mean

87.6 ± 3.1

86.8 ± 2.2

174.4 ± 3.3

0.8 ± 4.2

Nav_lit

87.6 ± 3.1

87.4 ± 1.9

175.0 ± 3.4

0.3 ± 3.8

Nav_opt

87.7 ± 3.4

86.9 ± 2.2

174.5 ± 3.4

0.8 ± 4.6

LLR Interobserver

LLR₁ vs. LLR₂

ICC

0.963

0.955

0.952

0.965

MAE

0.7

0.5

0.8

1.0

t-test

0.52

0.86

0.63

0.57

F-test

0.90

0.62

0.88

0.77

Literature Based

Nav_lit vs. LLR_mean

Error

-0.1 ± 2.6

-0.6 ± 1.7

-0.6 ± 2.9

0.5 ± 3.4

ICC

0.641

0.647

0.636

0.642

MAE

2.0

1.4

2.1

2.7

t-test

0.94

0.11

0.29

0.48

F-test

0.58

0.77

0.75

0.76

Optimized

Nav_opt vs. LLR_mean

Error

-0.1 ± 2.5

-0.1 ± 1.6

-0.1 ± 2.9

0 ± 3.1

ICC

0.703

0.734

0.641

0.755

MAE

1.9

1.3

2.2

2.5

t-test

0.90

0.83

0.83

0.99

F-test

0.53

0.79

0.74

0.53