Table 3.

Association between the stage of transferred embryo and clinical pregnancy by controlling the age groups

Age (yr)		Clinical pregnancy		RR (95% CI)	P-value
		No	Yes
≤ 35
	Blastocyst	23 (62.20)	14 (37.80)	0.76 (0.38, 1.52)	0.445
	Cleavage	22 (71.00)	9 (29.00)
> 35
	Blastocyst	24 (63.20)	14 (36.80)	0.45 (0.11, 1.71)	0.192
	Cleavage	10 (83.30)	2 (16.70)
Data are presented as n (%), Cochran-Mantel-Haenszel test, RR: Relative risk