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Table 1 Characteristics of study sample, N (%)

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

  Total Class I Class II Class III
N=4768 N=1632 N=1632 N=1504
Age group
 20-30 3600(75.5) 1168(71.6) 1184(72.5) 1248(83.0)
 >30 1168(24.5) 464(28.4) 448(27.5) 256(17.0)
Gender
 Male 2320(48.7) 816(50.0) 816(50.0) 688(45.7)
 Female 2448(51.3) 816(50.0) 816(50.0) 816(54.3)
Type
 Sagital 4768(50.0) 1632(50.0) 1632(50.0) 1504(50.0)
 Coronal 4768(50.0) 1632(50.0) 1632(50.0) 1504(50.0)
Tooth side
 Right 2384(50.0) 816(50.0) 816(50.0) 752(50.0)
 Left 2384(50.0) 816(50.0) 816(50.0) 752(50.0)
Root type
 U4 596(12.5) 204(12.5) 204(12.5) 188(12.5)
 U5 596(12.5) 204(12.5) 204(12.5) 188(12.5)
 U6MB 596(12.5) 204(12.5) 204(12.5) 188(12.5)
 U6DB 596(12.5) 204(12.5) 204(12.5) 188(12.5)
 U6P 596(12.5) 204(12.5) 204(12.5) 188(12.5)
 U7MB 596(12.5) 204(12.5) 204(12.5) 188(12.5)
 U7DB 596(12.5) 204(12.5) 204(12.5) 188(12.5)
 U7P 596(12.5) 204(12.5) 204(12.5) 188(12.5)