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. 2012 Dec 14;8:34. doi: 10.1186/1746-160X-8-34

Table 2.

Descriptive statistic for the variable Surface (mm2) calculated in the three groups

 
 N
 Mean (mm2)
 Std. Deviation
 Range
 Minimum
 Maximum
 Kurtosis
              Statistic Std. Error
CLASS II subjects
  
 Surface (right)
 68
 1145.68*
 197.67
 908.66
 729.21
 1637.87
 .568
 .574
 Surface (left)
 68
 1185.52*
 197.26
 1037.24
 765.70
 1802.94
 1.083
 .574
CLASS I subjects
  
 Surface (right)
 65
 1210.50
 191.92
 672.56
 881.18
 1553.74
 --.186
 .586
 Surface (left)
 65
 1226.49
 187.09
 595.04
 1039.68
 1634.72
 .646
 .586
CLASS III subjects
  
 Surface (right)
 65
 1365.76*
 226.74
 673.54
 1084.63
 1758.17
 −.933
 .586
 Surface (left) 65 1362.55* 263.18 670.74 1055.72 1726.46 −1.523 .586

For right surface: Chi-square: 10.367; p = 0.006 (Kruskal-Wallis test with skeletal class as grouping variable); Mann-Whitney U = 1108.00; p = 0.001 (post-hoc evaluation);

For left surface: Chi-square: 12.104; p = 0.002 (Kruskal-Wallis test with skeletal class as grouping variable); Mann-Whitney U = 1603.00; p = 0.006 (post-hoc evaluation).