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

?/th>	Birth year
?/th>	<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?000), by birth year.

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

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