Table 1.

Questionnaire for menstrual cycle characteristics

Question	Option	Category
Length pattern: How long menstrual cycle on an average have you had during the past 3 months?	Usually 27 to 32 d	Normal
	Usually 26 d or less	Short
	Usually longer than 32 d	Long
	Irregular length	Irregular
Menstrual Blood color: What is the color of your menstrual bleeding during past 3 months?	Usually dark red	Dark red
	Usually bright red	Bright red
	Usually light red	Light red
	Unknown	Unknown
Blood clots: Do you have blood clots during your menstrual flow during the past 3 months?	Sometimes, or usually	Yes (1)
	Never or occasionally	No (0)