Table 4.

Means and SD of retromolar space (mm) by gender, area of jaw and level of impaction

	Mean	SD	p value
Gender			<0.01*
Male	13.8	5.63
Female	11.9	2.85
Area of jaw			<0.01*
Maxillary	11.3	4.41
Mandibular	14.2	2.65
Level of impaction			<0.01*
A	14.7	2.12
B	11.1	3.14
C	10.3	1.86

Gender and area of jaw assessed by the Mann-Whitney U test, level of impaction by the Kruskal-Wallis test.

^*p < 0.05: statistically significantly different.