Group Gender, % Age, years
M (SD)
Occlusion, %
Male Female Normal Mandibular
retrognathia
Bimaxillary
retrognathia
A (n = 7) 100 66.7 52.2 (8.3) 28.6 57.1 14.3
B (n = 6) 0 33.7 44.0 (4.7) 0 83.3 16.7
P value 0.2a 0.03b χ2 = 2.0; df = 2; P = 0.7c

aBy Fisher's Exact Test.
bBy Mann-Whitney test.
cBy Chi-Square test.
M (SD) = mean (standard deviation).