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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