Table 3. Analysis of variance (ANOVA) of the relative brain sizes and other parameters at birth.

	Degree of freedom	Sum Square	Mean Square	F value	Pr(>F)
Genotypes*	1	0.007	0.007	9.790	0.002
Length of Pregnancy (week)	1	0.007	0.007	10.235	0.001
Body weight (g)	1	0.000	0.000	0.023	0.880
Sex	1	0.000	0.000	0.498	0.480
Residuals	1238	0.898	0.001

The genotype CC is compared against HC and HH and a dominant effect is assumed. Among the four variables considered, only the genotype and length of pregnancy in weeks were significant (p value <0.05). The rest of the variables including the body weight in grams and genders, all have p values greater than 0.05, indicating that they were not associated with the relative brain sizes.

^*Dominant effect is assumed. The genotype CC is compared with HC and HH.