Table 2.

Hypothesis I: Morphological features development for Chinese and US children brain and head.

Measurement	Figures	Nationality	Age
Brain length	Figure 1A	F(1) = 66.31***	F(4) = 2.89*
		US > CN	CN: inverted U
			US: U-shape
			But overall increase for CN, US
Brain width	Figure 1B	F(1) = 71.18***
		CN > US
Brain height	Figure 1C	F(1) = 10.95**	F(4) = 3.86**
		CN > US	Overall increase for both CN and US with similar patterns
ac-pc distance	Figure 1D		F(4) = 2.66*
			Overall increase for CN and US
Head length	Figure 2A	US > CN***	p < 0.001
			Overall increase for both CN and US
Head width	Figure 2B	CN > US***	p <.001
			Overall increase for both CN and US
Head height	Figure 2C	CN > US***

Significant level:

^*p < 0.05;

^**p < 0.01;

^***p < 0.001;

empty cell refers to non-significant results.