Table 5.

Test results for equality of tetrachoric correlations over sex for the dichotomous CAGE and comparability with polychoric correlations for the trichotomous CAGE, with thresholds and threshold deviations^d

	Test results sex differencesa		Dichotomous CAGE (0 vs. 1+ yes answers)				Trichotomous CAGE (0, 1, 2+ yes answers)
Age	χ2(3)b	p	MZ corr	DZ corr	th1c	Δ th1 femalesd	MZ corr	DZ corr	th1c	th2c	Δ th1 femalesd	Δ th2 femalesd
15–17	2.54	0.469	0.62	0.53	0.97	0.39	–e	–e	–	–	–	–
18–20	2.14	0.545	0.47	0.33	0.47	0.52	0.47	0.31	0.47	1.15	0.52	0.46
21–23	2.63	0.453	0.50	0.14	0.33	0.62	0.49	0.14	0.33	1.07	0.62	0.49
24–26	2.17	0.538	0.50	0.19	0.31	0.68	0.45	0.14	0.31	0.99	0.68	0.57
27–29	3.89	0.274	0.51	0.14	0.45	0.50	0.47	0.17	0.44	1.11	0.50	0.40
30–32	4.52	0.210	0.41	0.26	0.50	0.49	0.40	0.31	0.49	1.11	0.49	0.41

^aResults presented for testing sex differences in the correlations for the dichotomous CAGE

^bTesting for the equality of the correlations over sex results in a test with three degrees of freedom with a critical χ²(3) value of 7.815 (α = .05)

^cThreshold estimates

^dDeviation from threshold for females

^eNo polychoric correlations could be computed for the trichotomous CAGE in the 15–17 age group, since the frequency of 2+ yes answers was too low