Variable		SS	df	MS	F	p
A parents’ gender	PSK	3.60	1	3.60	11.01	0.001
A parents’ gender	PSEA	2.42	1	2.42	6.76	0.009
B parents’ age	PSK	1.18	3	0.39	1.20	0.31
B parents’ age	PSEA	1.26	3	0.42	1.17	0.32
C parents’ education background	PSK	6.29	2	3.15	9.62	<0.001
C parents’ education background	PSEA	4.76	2	2.38	6.65	0.001
A*B	PSK	0.40	3	0.13	0.41	0.75
A*B	PSEA	0.14	3	0.05	0.13	0.94
A*C	PSK	0.32	2	0.16	0.49	0.62
A*C	PSEA	0.45	2	0.23	0.63	0.53
B*C	PSK	2.14	6	0.36	1.09	0.37
B*C	PSEA	2.40	6	0.40	1.12	0.35
deviation	PSK	557.91	1705	0.33
deviation	PSEA	610.45	1705	0.36
Total	PSK	606.87	1728
Total	PSEA	645.77	1728