Table 2.

Menstrual cycle irregularity description.

	Questions	Number	Percentage %
1	When did you notice the changes in period? (290 response)
	After the first vaccination shot	102	35.2
	After the second vaccination shot	187	64.5
	After the third vaccination shot	1	0.3
2	Describe the kind of irregularity you had by choosing from the following (320 response)
	Periods that occur less than 21 days	107	33.4
	Periods that occur more than 35 days apart	112	35
	Missing period	28	8.8
	Menstrual flow was heavier than usual	100	31.3
	Menstrual flow was lighter than usual	76	23.8
	Periods that lasted longer than 7 days/periods longer than normal	93	29.1
	Periods were shorter than normal	41	12.8
	Periods that are accompanied by pain, cramping, nausea or vomiting	64	20
	Intermenstrual bleeding (vaginal bleeding at any time during the menstrual cycle other than during normal menstruation).	36	11.3
3	For how long the period irregularity lasted? (297 response)
	1–3 months	183	61.6
	4–6 months	87	29.3
	7–9 months	17	5.7
	More than 9 months	10	3.4
4	Did you visit the gynecologist upon having period irregularity? (359 response)
	Yes	84	23.5
	No	273	76.5