Table 3.

Multivariate co-relative model

	Model 1, school grades versus IQ HR (95% CIs)		Model 2, education level versus IQ HR (95% CIs)
Co-relative pairs	School Grades Concordant for IQ, discordant for school grades	IQ Concordant for school grades, discordant for IQ	Education level Concordant for IQ, discordant for education level	IQ Concordant for education level, discordant for IQ
	Observed model		Observed model
Population	0.59 (0.57; 0.60)	0.91 (0.89; 0.94)	0.75 (0.74; 0.75)	0.77 (0.76; 0.78)
Cousins	0.61 (0.54; 0.69)	0.91 (0.83; 1.00)	0.72 (0.68; 0.76)	0.76 (0.73; 0.79)
Half Sibling	0.57 (0.40; 0.82)	1.15 (0.88; 1.49)	0.79 (0.72; 0.88)	0.78 (0.72; 0.85)
Full Sibling	0.62 (0.52; 0.73)	0.91 (0.80; 1.04)	0.81 (0.77; 0.86)	0.79 (0.75; 0.82)
MZ Twin	-	-	-	-
AIC	308290.04	308655.92	1182370.1	1185196.9
	Predicted model		Predicted model
Population	0.59 (0.57; 0.60)	0.91 (0.89; 0.94)	0.74 (0.73; 0.75)	0.77 (0.76; 0.78)
Cousins	0.60 (0.58; 0.62)	0.91 (0.88; 0.94)	0.76 (0.75; 0.77)	0.77 (0.76; 0.78)
Half Sibling	0.61 (0.57; 0.66)	0.91 (0.86; 0.97)	0.77 (0.76; 0.80)	0.78 (0.76; 0.79)
Full Sibling	0.63 (0.55; 0.73)	0.91 (0.81; 1.02)	0.81 (0.77; 0.85)	0.78 (0.75; 0.81)
MZ Twin	0.68 (0.51; 0.92)	0.91 (0.72; 1.15)	0.88 (0.79; 0.97)	0.78 (0.73; 0.85)
AIC	308285.31	308652.48	1182367.0	1185191.6