Table 2. History of COVID-19 vaccine uptake and menstrual disturbance among the participants (n=673).

*Not mutually exclusive (sum exceeded 100%).

		Frequency	Percentage
Number of doses	Two	158	23.5
	Three	515	76.5
First vaccine dose	Pfizer-BioNTech	510	75.8
	Oxford-AstraZeneca	155	23.0
	Moderna	8	1.2
Menstrual changes after the first dose	No	364	54.1
	Yes*	309	45.9
	Increase in menstrual cycle length	82	12.2
	Decrease in menstrual cycle length	94	14.0
	More pain	154	22.9
	Increase in amount	96	14.3
	Decrease in amount	29	4.3
	Intermenstrual bleeding	91	13.5
Duration between the first dose and the booster	Less than one month	109	16.2
	1-2 months	158	23.5
	≥3 months	406	60.3
Second vaccine dose	Pfizer-BioNTech	500	74.3
	Oxford-AstraZeneca	147	21.8
	Moderna	26	3.9
Menstrual changes after the second dose	No	385	57.2
	Yes*	288	42.8
	Increase in menstrual cycle length	79	11.7
	Decrease in menstrual cycle length	72	10.7
	More pain	144	21.4
	Increase in amount	81	12.0
	Decrease in amount	27	4.0
	Intermenstrual bleeding	84	12.5
Duration of changes in the cycles after COVID-19 vaccine (one dose or both doses) (n=303)	Less than one month	129	42.5
	1-2 months	92	30.4
	≥3 months	82	27.1