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Table 2 Tetrachoric twin correlations (r) with 95% confidence interval (95%CI) for 18-25 year old twins from two birth cohorts

From: Interplay between heritability of smoking and environmental conditions? A comparison of two birth cohorts

 

1993-1995

2009-2010

Combined

(1993-1995 &

2009-2010)

 

r

95%CI

r

95%CI

r

95%CI

MZM

.82

.70-.90

.75

.43 - .91

.80

.70 - .88

DZM

.51

.30-.67

.37

.04 - .72

.47

.29 - .63

MZF

.77

.66-.85

.80

.65 - .89

.78

.70 - .85

DZF

.69

.55 -.81

.66

.44 - .81

.67

.55 - .77

DOS

.40

.26 - .54

.34

.11 - .54

.38

.25 - .49

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BMC Public Health

ISSN: 1471-2458

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