Table 1.

Characteristics of the participants.

		Group FN (n = 26)	Group TN (n = 22)	Group FP (n = 25)	Group TP (n = 27)	P-value
Age (years)		33.0 ± 3.9	32.5 ± 4.0	31.2 ± 4.0	31.1 ± 4.4	0.247 a
BMI (kg/m2)		23.2 ± 3.2	23.2 ± 4.0	23.3 ± 4.1	22.8 ± 3.3	0.974 a
Infertility duration (years)		3.4 ± 2.5	4.3 ± 2.3	3.4 ± 2.1	4.6 ± 2.9	0.238 b
Smoking	Yes	0	2 (9.1%)	1 (4.0%)	2 (7.4%)	0.524 c
	No	26 (100%)	20 (90.9%)	24 (96.0%)	25 (92.6%)
Alcoholism	Yes	0	1 (4.5%)	0	0	0.220 c
	No	26 (100%)	21 (95.5%)	25 (100%)	27 (100%)
Menstrual cycle	regular	25 (96.2%)	18 (81.8%)	21 (84.0%)	25 (92.6%)	0.297 c
	irregular	1 (3.8%)	4 (18.2%)	4 (16.0%)	2 (7.4%)
Indication d	Male factors	10 (38.5%)	9 (40.9%)	13 (52.0%)	10 (37.0%)	0.704 c
	Tubal factors	14 (53.8%)	16 (72.7%)	13 (52.0%)	19 (70.4%)	0.305 c
	PCOS	4 (15.4%)	3 (13.6%)	3 (12.0%)	5 (18.5%)	0.962 c
	Ovarian dysfunction	2 (7.7%)	2 (9.1%)	2 (8.0%)	2 (7.4%)	1.000 c
	Unexplained	4 (15.4%)	1 (4.5%)	2 (8.0%)	2 (7.4%)	0.657 c
	Others	1 (3.8%)	1 (4.5%)	4 (16.0%)	2 (7.4%)	0.459 c
Previous pregnancy times		0.88	0.59	0.56	0.74	0.862 b
Previous childbirth times		0.15	0.05	0.08	0	0.332 b
Previous miscarriage times		0.42	0.50	0.36	0.59	0.884 b
Previous ectopic pregnancy times		0.23	0.00	0.12	0.15	0.166 b
Previous IVF cycle		0.42	0.50	0.24	0.81	0.082 b

Values are given as mean ± SD, number (%), and mean. BMI, Body Mass Index; PCOS, polycystic ovary syndrome; IVF, In Vitro Fertilization; FN, fresh IVF-ET cycle non-pregnancy; FP, fresh IVF-ET cycle pregnancy; TN, frozen-thaw ET cycle non-pregnancy; TP, frozen-thaw ET cycle pregnancy.

^aBy One way ANOVA.

^bBy Kruskal-Wallis H test.

^cBy chi-square test.

^dNot 100% in total due to multiple diagnoses for some patients.

*P < 0.05.