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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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