. 2022 Nov 28;19(23):15854. doi: 10.3390/ijerph192315854

Table 3.

The dominant swimming style undertaken by the athletes and its influence on the characteristics of menstrual bleeding.

		The Dominant Swimming Style
		Freestyle		Backstroke		Breaststroke		In Total
chi²(2) = 1.23; p = 0.542
chi²(2) = 1.23; p = 0.542		N	%	N	%	N	%	N	%
Menstruation painfulness	Painful at the beginning	28	82.35	9	90.00	14	73.68	51	80.95
Menstruation painfulness	Painful all the time	6	17.65	1	10.00	5	26.32	12	19.05
	In total	34	100.00	10	100.00	19	100.00	63	100.00
chi²(6) = 3.77; p = 0.708
chi²(6) = 3.77; p = 0.708		N	%	N	%	N	%	N	%
Does swimming training during menstruation affect the degree of pain feeling?	It reduces pain	19	54.29	3	30.00	11	57.89	33	51.56
	It increases pain	5	14.29	1	10.00	1	5.26	7	10.94
	No influence is observed	9	25.71	5	50.00	6	31.58	20	31.25
	Does not train during menstruation	2	5.71	1	10.00	1	5.26	4	6.25
	In total	35	100.00	10	100.00	19	100.00	64	100.00
chi²(2) = 0.28; p = 0.869
		N	%	N	%	N	%	N	%
Bleeding is less heavy	No	31	88.57	9	90.00	16	84.21	56	87.50
Bleeding is less heavy	Yes	4	11.43	1	10.00	3	15.79	8	12.50
	In total	35	100.00	10	100.00	19	100.00	64	100.00
chi²(2) = 3.08; p = 0.215
		N	%	N	%	N	%	N	%
Bleeding is more heavy	No	24	68.57	8	80.00	17	89.47	49	76.56
Bleeding is more heavy	Yes	11	31.43	2	20.00	2	10.53	15	23.44
	In total	35	100.00	10	100.00	19	100.00	64	100.00
chi²(2) = 0.07; p = 0.964
		N	%	N	%	N	%	N	%
Bleeding lasts less than 3 days	No	26	74.29	7	70.00	14	73.68	47	73.44
Bleeding lasts less than 3 days	Yes	9	25.71	3	30.00	5	26.32	17	26.56
	In total	35	100.00	10	100.00	19	100.00	64	100.00
chi²(2) = 0.71; p = 0.700
		N	%	N	%	N	%	N	%
Amenorrhea	No	30	85.71	9	90.00	15	78.95	54	84.38
Amenorrhea	Yes	5	14.29	1	10.00	4	21.05	10	15.63
	In total	35	100.00	10	100.00	19	100.00	64	100.00