Sex Determination Using Inion-Opistocranium-Asterion (IOA) Triangle in Nigerians’ Skulls

Table 3

Percentiles of inion-opistocranium, right and left^# inion-asterion length and right and left^# IOA index in males and females.

	Sex	10th	25th	50th (Median)	75th	90th	Normality test
Inion-opistocranium length	Male	24.43	26.66	29.83	32.56	34.88	<0.0001*
	Female	14.21	15.83	21.16	26.67	32.10	0.4179
Inion-asterion length	Male	58.71	61.11	63.39	65.93	68.54	0.4629
		[60.15]^#	[61.83]	[64.48]	[67.27]	[70.09]	[0.1111]
	Female	48.01	53.25	59.84	61.11	61.21	0.1598
		[55.03]^#	[58.95]	[60.63]	[61.14]	[61.31]	[0.0027*]
Right/[Left]^# IOA index	Male	39.24	41.95	46.06	52.07	56.46	0.0002
		[36.22]^#	[41.54]	[45.52]	[50.32]	[56.66]	[0.0001*]

^∗𝑃<0.05 statistically significant from male.
#Data in parenthese represent Percentiles of left length, inion-opistocranium, and left inion-asterion; left IOA index.