Table 7. Summary statistics for analysis of each trait of Yanshan population and selected congeners.

Trait		Levene’s test			Regression model
		Statistic	Assignment		Type	F-test/Chi sq test
Variance test probabilities of linear models (F-tests) and generalized linear models (Chi-square tests) are provided. –: Not available. NS: Not significant.
Mensural traits
TrunkL		0.029	Unequal		gls	<0.001
ED		0.028	Unequal		gls	0.002
HL		0.093	Equal		lm	<0.001
HW		0.497	Equal		lm	<0.001
NarEye		0.292	Equal		lm	<0.001
SnEye		0.613	Equal		lm	<0.001
SnW		0.311	Equal		lm	<0.001
Meristic traits
DS		–	–		glm	<0.001
VS		–	–		glm	NS
CN		–	–		glm	<0.001
IS		–	–		glm	<0.001
SL		–	–		glm	0.024
IL		–	–		glm	NS
CloacS		–	–		glm	0.030
SL1F		–	–		glm	<0.001
SL1T		–	–		glm	<0.001
Chin		–	–		glm	NS