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Emerging Infectious Diseases Journal
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Volume 2: No. 2, April 2005

ORIGINAL RESEARCH
Secular Trends in Age at Menarche, Smoking, and Oral Contraceptive Use Among Israeli Girls

  Birth year
<1970 1970–1972 1973–1975 1976–1978 >1978
Mean age at menarche in years (SD) 13.41 (1.30) 13.31 (1.29) 13.19 (1.30) 13.10 (1.27) 13.03 (1.28)
% having ever smoked 23.55 19.47 22.74 27.14 32.86
% having ever used oral contraceptives 25.49 23.05 29.31 30.43 31.24

Figure.
Trend for age at menarche (P <.001) and proportion of recruits having ever smoked (P <.001) or used oral contraceptives (P <.001) among female Israeli army recruits (1986–2000), by birth year.

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