The Average Age of Menarche Increased Between the 1800s and 1960

Q5: The 1997 PROS study reported a substantially

Q6: Girls who reach menarche earlier tend to

Q7: Recent findings from the Nurses' Health Study

Q8: Explain how a pregnant woman's smoking may

Q9: Findings in NHANES III and other studies

Q10: What environmental factors are believed to influence

Q11: It is believed that body size could

Q12: Heavier girls are more likely to reach

Q13: High levels of dioxin have been associated

Q15: In a 1930s study, Nicholas Michelson attributed