Table 4.

Estimates of tetrachoric correlations^a (with standard errors) for the CAGE as dichotomy (0 vs. 1+ yes answers)

MZM	15–17	18–20	21–23	24–26	27–29	30–32	DZM	15–17	18–20	21–23	24–26	27–29	30–32
15–17	.73 (.14)						15–17	.68 (.17)
18–20	.29 (.18)	.50 (.10)					18–20	.19 (.22)	.32 (.13)
21–23	.19 (.21)	.43 (.10)	.57 (.08)				21–23	.11 (.26)	−.10 (.16)	.08 (.14)
24–26	.09 (.24)	.26 (.11)	.33 (.09)	.59 (.09)			24–26	.08 (.34)	.26 (.17)	.34 (.15)	.05 (.17)
27–29	−.16 (.36)	.41 (.13)	.43 (.11)	.50 (.09)	.57 (.12)		27–29	.03 (.44)	.41 (.18)	.17 (.16)	.24 (.14)	.28 (.19)
30–32	.43 (.33)	−.10 (.20)	.24 (.14)	.36 (.12)	.36 (.13)	.35 (.17)	30–32	.43 (.45)	.31 (.22)	.03 (.20)	.27 (.17)	−.03 (.18)	−.06 (.23)

MZF	15–17	18–20	21–23	24–26	27–29	30–32	DZF	15–17	18–20	21–23	24–26	27–29	30–32
15–17	.54 (.15)						15–17	.56 (.25)
18–20	.43 (.15)	.42 (.09)					18–20	.41 (.33)	.45 (.11)
21–23	.53 (.12)	.43 (.10)	.44 (.09)				21–23	.05 (.30)	.30 (.15)	.27 (.13)
24–26	.13 (.18)	.60 (.08)	.32 (.09)	.43 (.10)			24–26	−.01 (.31)	.05 (.17)	.14 (.14)	.27 (.14)
27–29	.09 (.24)	.43 (.11)	.43 (.08)	.39 (.08)	.49 (.09)		27–29	.21 (.38)	.32 (.16)	.00 (.17)	.27 (.12)	.27 (.16)
30–32	.21 (.25)	.51 (.14)	.36 (.11)	.40 (.10)	.50 (.08)	.44 (.11)	30–32	.30 (.43)	−.16 (.28)	.33 (.16)	.23 (.14)	.22 (.14)	.20 (.18)

DOS	15–17	18–20	21–23	24–26	27–29	30–32
15–17	.48 (.17)
18–20	.10 (.16)	.26 (.10)
21–23	−.06 (.19)	−.04 (.12)	.06 (.11)
24–26	.17 (.16)	−.06 (.13)	−.16 (.10)	.20 (.12)
27–29	−.02 (.24)	− .06 (.15)	.04 (.11)	−.13 (.10)	−.11 (.16)
30–32	−.28 (.28)	−.30 (.19)	.10 (.13)	.13 (.11)	−.09 (.13)	.48 (.14)

^aCross twin-within age correlations at diagonal in italic and cross twin-cross age correlations off-diagonal