Dysmenorrhea is estimated to occur in 20% to 90% of women of reproductive age. It is the most common menstrual disorder. Typically it starts within a year of the first menstrual period. When there is no underlying cause often the pain improves with age or following having a child.
PEI is 224 kms long. If you were doing an average walking pace of 5 kms an hour, and you could survive without sleep or stopping to eat,bit would take you 46 hours or just under 2 days. The width varies greatly, from an hour to an afternoon. Views Â· View Upvotes.
Structure [edit]. The molecular formula of the repeating unit of PEI is C 37 H 24 O 6 N 2 and the molecular weight is 592 g/mol. The glass transition temperature of PEI is 217 Â°C.