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. Author manuscript; available in PMC: 2008 Jun 15.
Published in final edited form as: Drug Alcohol Depend. 2006 Dec 13;89(1):42–51. doi: 10.1016/j.drugalcdep.2006.11.017

Table 6.

The intrapair correlations and 95% confidence intervals for the NDSS sum score, three NDSS factors and FTND in male and female regular smoking MZ and DZ twin pairs (N=291 pairs)

Men Women
Variable MZ DZ MZ DZ Opposite sex pairs
(N pairs) 47 96 18 33 97
Sum score 0.41 0.14, 0.62 0.22 −0.02, 0.40 0.34 −0.15, 0.69 −0.09 −0.42, 0.26 −0.08 −0.28, 0.12
 Drive/Priority 0.24 −0.09, 0.51 0.26 0.05, 0.45 −0.03 −0.50, 0.46 0.04 −0.32, 0.40 −0.02 −0.24, 0.20
 Stereotypy/Continuity 0.46 0.17, 0.68 0.21 −0.014, 0.40 0.20 −0.32, 0.62 0.21 −0.17, 0.53 0.06 −0.17, 0.27
 Tolerance 0.26 −0.06, 0.53 0.28 0.071, 0.47 0.59 0.15, 0.82 0.19 −0.18, 0.52 −0.02 −0.22, 0.18
FTND 0.55 0.31, 0.72 0.21 0.01, 0.40 0.16 −0.34, 0.58 0.28 −0.07, 0.57 0.14 −0.6, 0.34