Table 1.

Comparison of demographic characteristics in two study groups

Variables		Case group (n = 31)	Control group (n = 31)	p-value
Age (y)*		32.61 $\pm$ 4.40	31.96 $\pm$ 4.22	0.558${}^a$
Duration of infertility (y*)		6.93 $\pm$ 3.94	7.48 $\pm$ 2.99	0.540${}^a$
Type of infertility **
	Primary	22 (71.0)	24 (77.4)
	Secondary	9 (29.0)	7 (22.6)	<brow>-2</erow> 0.562${}^b$
Cause of infertility *
	Male factor	9 (29.0)	13 (41.9)
	Poly cystic ovarian syndrome	5 (16.1)	4 (12.9)
	Tubal factor	3 (9.7)	1 (3.2)
	MIX	9 (29.0)	8 (25.8)
	Unexplained	5 (16.1)	4 (12.9)
	Ovarian factor	0 (0.0)	1 (3.2)	<brow>-6</erow> 0.699${}^b$
Endometrial thickness (mm)*		8.70 $\pm$ 1.08	8.94 $\pm$ 1.33	0.521${}^b$
Cycle day*		15.38 $\pm$ 2.29	16.38 $\pm$ 1.92	0.068${}^b$
No. of transferred embryos*		1.90 $\pm$ 30	1.83 $\pm$ 0.52	0.554${}^b$
Embryo quality **
	Grade A	22 (71)	20 (64.5)
	Grade B	7 (22.6)	5 (16.1)
	Grade C	2 (6.5)	6 (19.4)	<brow>-3</erow> 0.297${}^b$
* Data presented as Mean $\pm$ SD. ** Data presented as n (%) a: Mann-Whitney U test, b: Chi-square