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Table 1 Prevalence of smoking initiation in 18-25 year olds in 1993-1995 and 2009-2010

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

  18-25 year old twins in
1993-1995
18-25 year old twins in
2009-2010
  N total N ever
smoked
% ever
smoked
N total N ever
smoked
% ever
smoked
Men:       
MZ 415 190 45.8% 301 44 14.6%
DZ ss 363 184 50.7% 239 69 28.9%
DZ os 384 218 56.8% 228 62 27.2%
Total 1162 592 50.9% 768 175 22.8%
Women:       
MZ 658 224 34.0% 728 128 17.6%
DZ ss 462 195 42.2% 445 122 27.4%
DZ os 385 176 45.7% 400 102 25.5%
Total 1505 595 39,5% 1573 352 22.4%