The researchers looked at reproductive age women, between 18 and 53, as menstruation is known to lower iron levels.
Ms. Sebelius, in a letter to the FDA, noted that 10% of females reach reproductive age by 11 years old.
Nearly 4% of women of reproductive age are infected, as are more than one in 10 police officers and soldiers.
Coral-reef fish tend to grow slowly, take many years to reach reproductive age, and then spawn in only a few localised sites.
Around 10 to 25% of women of reproductive age are estimated to be affected by endometriosis and about two million women in the UK have the condition.
One, in 1996, estimated that 5% of rapes of victims of reproductive age led to pregnancy, based on repeated phone surveys of the same group of women.
Half of India's population is in the reproductive age group.
The post-war "baby-boom" generation is now reaching reproductive age.
Writing in JAMA, the researchers led by Dr Lee Cohen, said the prevalence of depression in reproductive age women, their level of anti-depressant use and the frequency of unplanned pregnancy, it was important to be able to tell patients about comparative risk of relapse linked to stopping or continuing with their medication.
Some animals can even learn about each other's sex, reproductive status, age and dominance status, just by smelling.
Dr Yacoub Kalaf, consultant in reproductive medicine and surgery at Guy's Hospital, says that research suggests there is an age after which men suffer from reproductive ageing.
But Wickerham says those factors are not as important as age, family history, reproductive history and race.
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