TABLE 5 GENETIC ANALYSES OF CIGARETTE SMOKING, ALCOHOL USE, AND COFFEE CONSUMPTION WITH AND WITHOUT ADJUSTMENT FOR COVARIATES

 

Intraclass Correlations

Genetic Variance

Individual Environment

Shared Environment

Substance Use

MZ

DZ

H

E

C

Smoking

Log (cig)

0.50

0.24

0.52

0.50

(−0.02)

Adjusted

0.38

0.17

0.42

0.62

(−0.04)

Alcohol

Log (dose)

0.51

0.33

0.36

0.49

0.15

Adjusted

0.22

0.37

0.30

0.63

(0.07)

Coffee

Log (dose)

0.42

0.21

0.44

0.54

(0.02)

Adjusted

0.43

0.22

0.42

0.57

(0.01)

Note: Values in parentheses are not significantly different from zero.



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