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Table 4 The vertical distance between the posterior maxillary roots apices and the maxillary sinus floor related to age, gender, sides, and scores in the coronal 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 9.2±8.0 3.2±5.1 1.5±3.6 1.3±3.1 1.6±3.7 0.6±2.9 1.3±3.1 2.4±3.5 <0.001
>30 13.6±9.3 5.8±6.6 3.5±5.0 2.8±3.9 3.0±4.1 1.6±3.2 2.3±5.2 3.4±4.1 <0.001
P-value* <0.001 <0.001 <0.001 <0.001 <0.001 0.001 <0.001 <0.001  
Gender Male 10.6±8.9 3.9±6.2 2.4±4.7 1.8±3.9 1.9±4.3 0.9±3.4 1.4±3.7 2.4±4.0 <0.001
Female 10.0±8.1 3.8±5.0 1.7±3.3 1.6±2.8 2.0±3.7 0.8±2.5 1.7±3.8 2.8±3.4 <0.001
P-value* 0.741 0.083 0.956 0.166 0.041 0.11 0.001 <0.001  
Side Right 10.2±8.5 4.0±5.6 2.1±4.2 1.7±3.3 2.0±3.8 0.8±3.0 1.7±3.4 2.8±3.7 <0.001
Left 10.4±8.5 3.7±5.6 1.9±4.0 1.6±3.4 1.9±3.9 0.8±2.9 1.4±4.1 2.5±3.7 <0.001
P-value* 0.648 0.293 0.545 0.446 0.891 0.532 0.51 0.3  
Score Type 1 12.0±8.0 7.1±5.5 4.9±4.1 3.9±3.4 4.8±3.6 3.5±2.9 4.0±3.4 4.5±3.5 <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 0.148
Type 2LC 0.15±0.35 0.01±0.01 0.01±0.01 0.03±0.11 0.01±0.01 0.01±0.01 0.01±0.01 0.04±0.13 0.89
Type 2P -1.2±0.5 -1.2±0.8 -1.5±1.2 -1.4±1.0 -1.5±1.0 -1.6±1.3 -1.5±3.2 -1.1±1.0 <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