Medicare Part D Prescription Drug Coverage Costs. Medicare Part D prescription drug coverage helps beneficiaries with the costs of their prescription medications. If you decide to enroll in Medicare Part D, some of your costs may include out-of-pocket expenses such as copayments, coinsurance, monthly premiums, and annual deductibles.
The average age of menarche, or first menstruation, in the United States is 12.88 years for Caucasian girls and 12.16 years for African American girls. A popular misconception is that menarche marks the beginning of puberty; in reality, menarche occurs later in puberty.
Menarche is the term used to indicate the onset of a girl's very first menstrual period. The female menstrual cycle is typically 28 days in length but can vary from 21 to 34 days in length and still be considered normal. Menstruation itself lasts a couple of days to a week.