A Comparative Study of Palatal Rugae Patterns among Igbo and Ikwerre Ethnic Groups of Nigeria: A University of Port Harcourt Study

Table 4

Association between the tribe and sex with rugae pattern distribution.

	Ikwerre		Igbo		DF	Chi-square ()	Critical value	Chi () calculated value	Inference
	Male	Female	Male	Female
Rugae patterns
Wavy	119	117	161	188	15	36.74	24.996	<0.001	Significant association *
Curvy	151	99	87	82
Circular	12	14	19	21
Straight	33	34	19	15
Converging	7	7	10	5
Diverging	13	18	16	3

The asterisks were used to demonstrate values with significant difference.