Table 2 The measurement results of skeletal Class I and mild skeletal Class III (unit: mm)

Skeletal Class I

Man

2.90 ± 1.67

1.57 ± 2.46

1.64 ± 1.61

Female

3.20 ± 1.79

1.05 ± 1.97

1.49 ± 1.64

P-values

0.665^a

0.544^a

0.827^a

ICC

0.937

0.940

0.986

95% CI

0.827–0.978

0.830–0.980

0.961–0.965

Mild skeletal Class III

Man

1.79 ± 2.40

− 0.79 ± 2.10

1.43 ± 1.29

Female

2.41 ± 3.22

− 1.78 ± 2.79

0.86 ± 1.37

P-values

0.618^b

0.289^a

0.250^a

ICC

0.877

0.957

0.872

95% CI

0.173–0.970

0.876–0.985

0.660–0.955