Table 4

Smoking initiation by birth cohort, age (in diagonals), study year, and educational level in women

Birth cohortSmoking initiation by year (%)Age (years)
197219771982198719921997
Less highly educated women
1913–191763
1918–1922565
1923–1927910119
1928–193212111078
1933–1937151419181711
1938–194217192423191960–64
1943–194729312729263055–59
1948–1952354443392550–54
1953–19576158564645–49
1958–196255544740–44
1963–1967544235–39
1968–19725530–34
25–29
Total131524293234
More highly educated women
1913–19171110
1918–192216129
1923–192719161618
1928–1932141317911
1933–1937141719151632
1938–194219202324212060–64
1943–194728282626212755–59
1948–1952423736353550–54
1953–19573838454145–49
1958–196227322740–44
1963–1967293135–39
1968–19723630–34
25–29
Total171823252731
  • Odds ratios and significance levels from logistic regression analyses: multivariate model: study year 1.43 (p<0.001); education 1.38 (p<0.001); interaction between study year and education 0.90 (p<0.001). Less highly educated: one-factor models: study year 1.28 (p<0.001); age group 0.72 (p<0.001); birth cohorts 1913–17 to 1953–57 1.45 (p<0.001) and birth cohorts 1958–62 to 1968–72 1.05 (p = 0.39). More highly educated: one-factor models: study year 1.16 (p<0.001); age group 0.86 (p<0.001); birth cohorts 1913–17 to 1953–57 1.20 (p<0.001) and birth cohorts 1958–62 to 1968–72 0.90 (p = 0.06).

  • For an explanation of educational level, see text.