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Table 3 The vertical distance between the posterior maxillary roots apices and the maxillary sinus floor related to age, gender, sides, and scores in the sagittal view

From: Three-dimensional assessment of the favorability of maxillary posterior teeth intrusion in different skeletal classes limited by the vertical relationship with the maxillary sinus floor

   U4 U5 U6 U7 P-valueª
U6MB U6DB U6P U7MB U7DB U7P
Age 20-30 5.4±4.7 2.4±3.9 1.1±3.3 1.3±3.2 1.4±4.3 0.4±3.2 0.9±3.4 1.8±3.9 <0.001
>30 8.0±5.1 4.2±4.6 2.8±4.0 2.7±3.7 2.9±4.7 1.3±3.7 2.1±4.2 3.1±4.5 <0.001
P-value* <0.001 <0.001 <0.001 <0.001 <0.001 0.007 0.002 0.002  
Gender Male 6.0±5.1 2.7±4.5 1.6±4.0 1.7±3.9 1.5±4.9 0.4±3.8 1.0±4.2 1.8±4.4 <0.001
Female 6.1±4.7 2.9±3.8 1.5±3.1 1.6±2.9 2.1±3.9 0.8±2.8 1.4±3.0 2.5±3.8 <0.001
P-value* 0.339 0.027 0.117 0.036 0.003 <0.001 <0.001 0.003  
Side Right 6.0±5.0 2.9±4.2 1.5±3.6 1.6±3.4 1.8±4.5 0.7±3.4 1.2±3.7 2.3±4.2 <0.001
Left 6.1±4.9 2.8±4.0 1.5±3.5 1.6±3.4 1.8±4.4 0.6±3.3 1.2±3.7 1.9±4.0 <0.001
P-value* 0.621 0.782 0.907 0.824 0.843 0.69 0.735 0.437  
Score Type 1 6.8±4.7 5.4±3.8 4.2±3.3 4.0±3.4 5.3±3.8 3.7±3.0 4.1±3.4 4.6±3.7 <0.001
Type 2C 0.01±0.01 0.01±0.01 0.01±0.01 0.01±0.01 0.01±0.01 0.01±0.01 0.01±0.01 0.01±0.01 0.765
Type 2LC 0.01±0.00 0.02±0.03 0.01±0.00 0.01±0.00 0.01±0.01 0.01±0.01 0.02±0.01 0.01±0.00 0.143
Type 2P -1.0±0.5 -1.3±0.8 -1.6±1.2 -1.3±1.0 -2.1±1.4 -2.0±1.3 -1.8±1.2 -2.0±1.4 <0.001
P-valueª <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001  
  1. ª Kruskal-Wallis Test; * Mann-Whitney Test