Variables n King Saudi (n=365) % n King Faisal (n=92) % Total (n=457) 3-15 6.89 ± 2.29 Age: Range Mean ± SD t test P 3-15 6.81 ± 2.30 1.102 0.641 190 175 52.1 47.9 0.21 0.643 51 41 4-12 7.21 ± 2.25 Sex: Males Females X 2 P 55.4 44.6 241 216 52.7 47.3 reported by other studies. 7 But the class III was slightly higher than the 3.3% of the Najat et al study. The prevalence of a 'normal' overbite was found in more than half of the sample 54.57%, and anterior open bite was found in only 17.2%. These results are compatible with other studies 7 9.2% of the Najat’s study and 24% in Foster’s study [Table 1]. 7 The prevalence of a deep bite was 16.94% and an edge to edge bite was 11.29%. We found an increased over jet (more than 4 mm) in 19.22% of the children; this corresponds to the results of other studies. 2 In the Najat et al study it was 24.2% as the percentage of an overjet but with an overjet of more than 2mm. The prevalence of normal overjet was 69.64% in our study. The prevalence of posterior cross-bite as reported in studies varies from 4% to 11% 7 Table 1. 7 It corresponds to the results of our study where posterior crossbite was found in 5% of the studied children. The preva-lence of anterior crossbite was 4.7%, our result was double the result of 1.7% reported in the Najat et al study. The children with both anterior and posterior crossbite were 3.2%. The prevalence of normal midline finding was 56.2% and the deviation was 34.9%. There is no significant differ-ence in the prevalence of gender (p<0.587). But there is significant prevalence between molars and canines in both sides (p=0.000). 34 March/April 2013 JAOS
Journal of the American Orthodontic Society March-April 2013: Page 34
