Table 4.

Characteristics of cycles with positive and negative clinical pregnancy

Variable	Positive pregnancy, n = 43	Negative pregnancy, n = 85	P
Age, year	35.8 ± 3.2	35.9 ± 3.6	NS
Endometrial preparation, hormone replacement, %	74.4	82.4	NS
Peak endometrium thickness, cm	1.1 ± 0.3	1.1 ± 0.2	NS
Containing embryos from top morula (M1), n (%)	16 (37.2)	26 (30.6)	NS
No. of embryos transferred per cycle, n	1.8 ± 0.6	1.7 ± 0.5	NS
No. of blastocystsa contained in transferred embryos	1.7 ± 0.7	1.4 ± 0.6	0.023
No. of top blastocystsa contained in transferred embryos	0.9 ± 0.7	0.4 ± 0.6	<0.001

^aBlastocysts developed from thawed morulas

NS Not significant