Mild (n = 13)

7.5 ± 1.7

Moderate (n = 27)^†

9.96 ± 3.7

1.332

0.978 - 1.825

0.069

Severe (n = 55)^†

11.0 ± 6.2

1.464

1.050 - 2.042

0.024

Occlusion (n = 67)^‡

9.1 ± 4.1

0.790

0.684 - 0.913

0.001