Table 4. ANOVA results of four factor analysis based on mean values of verbal, performance and full scale IQ.

	Model I						Model II
	Source	df	ss	ms	F-value	p-value	Source	df	ss	ms	F-value	p-value
VIQ
	Population	04	546.08	136.52	0.0645	0.9917	Residence	01	1084.5	1084.5	0.9987	0.3316
	Gender	01	4.43	4.43	0.0021	0.7017	SES	02	3268.973	1634.4865	1.5052	0.2501
	Age	09	13325.65	1480.62	0.6998	0.9639	Age	09	8002.68	889.18	0.8188	0.6072
	Inbreeding	01	27954.30	27954.30	13.2126	0.0018***	Inbreeding	01	14721.29	14721.29	13.5575	0.0018***
	Within Groups	19	40198.71	2115.72			Within Groups	17	18459.34	1085.84
PIQ
	Population	04	350.81	87.70	0.02926	0.9982	Residence	01	191.9005	191.9005	0.1264	0.7266
	Gender	01	6.11	6.11	0.00203	0.8428	SES	02	4424.3895	2212.1947	1.4573	0.2605
	Age	09	14002.61	1555.84	0.51911	0.9645	Age	09	8671.4005	963.4889	0.6347	0.753
	Inbreeding	01	39858.22	39858.22	13.2988	0.0017***	Inbreeding	01	21173.8995	21173.8995	13.9491	0.0016***
	Within Groups	19	56945.08	2997.11			Within Groups	17	25804.901	1517.9353
FSIQ
	Population	04	464.86	116.21	0.04619	0.9956	Residence	01	546.69	546.69	0.42709	0.5222
	Gender	01	1.59	1.59	0.00063	0.8167	SES	02	3828.1561	1914.07805	1.4953	0.2522
	Age	09	12555.44	1395.05	0.5545	0.9802	Age	09	8091.6296	899.0699	0.70239	0.6991
	Inbreeding	01	33628.87	33628.87	13.3668	0.0017***	Inbreeding	01	17808.3793	17808.3793	13.9127	0.0017***
	Within Groups	19	47801.26	2515.85			Within Groups	17	21760.1104	1280.0065

Model I = Population×Gender×Age×Inbreeding, Model II = Residence×SES×Age×Inbreeding.

df = degrees of freedom; ss = sum of squares; ms = means square; SES = socioeconomic status.

In Model I, the population, gender, and age based differences are found to be non-significant for all cognitive tests.

In Model II, the residence, SES and age are found to be insignificant.

Inbreeding is found to be significant for all cognitive parameters in both the models.

***Statistically significant at p<0.001.