Table 4.

The correlation analysis between the type of COVID-19 vaccine and the menstrual cycle duration.

Crosstabulation
			For how long the periperod irregularity lasted (months)?					Total
			No response	1–3	4–6	7–9	More than 9 months
Which type of the following vaccine did you take?	Pfizer-BioNTech	Count	149	105	47	8	3	312
		%	47.8%	33.7%	15.1%	2.6%	1.0%	100.0%
	AstraZeneca	Count	31	21	10	4	2	68
		%	45.6%	30.9%	14.7%	5.9%	2.9%	100.0%
	Sinopharm	Count	88	55	27	5	4	179
		%	49.2%	30.7%	15.1%	2.8%	2.2%	100.0%
	Moderna	Count	1	1	1	0	0	3
		%	33.3%	33.3%	33.3%	0.0%	0.0%	100.0%
	Else	Count	0	0	1	0	1	2
		%	0.0%	0.0%	50.0%	0.0%	50.0%	100.0%
Total		Count	269	182	86	17	10	564
		%	47.7%	32.3%	15.2%	3.0%	1.8%	100.0%

Chi-Square Test
	Value	df	Significance (two-sided)
Pearson Chi-Square	34.914a	16	0.004*
Likelihood Ratio	14.218	16	0.582
N of Valid Cases	564

^a13 cells (52.0%) have expected count less than 5. The minimum expected count is 0.04, ^* significant.