TABLE 2.

Twin Pair Polychoric Correlations and Univariate Twin Structural Equation Model Parameter Estimates for Self-Reported Hypertension Above and Below the Median Split of Years of Education (≤14 years or >14 years)

Variables	Twin Pair Correlations		a2	e2	Model Fit
	Rmz	Rdz			−2lnL	df
≤14 years of education	0.46	0.23	0.46	0.54	2573.34	2159
Hypertension	0.32 to 0.58a	0.16 to 0.29	0.32 to 0.58	0.42 to 0.68
>14 years of education	0.63	0.32	0.63	0.37	3863.41	3308
Hypertension	0.54–0.71	0.27–0.35	0.54–0.71	0.29–0.46

−2lnL = twice the log likelihood; df = degrees of freedom.

^a95% Confidence Interval.