Table 1.

Clinical characteristics of included women.

Variables		Control group	Crinone group	P
Number		685	928
Age		32.16 ± 4.708	31.96 ± 4.308	.383
Age of husband		33.45 ± 5.331	33.36 ± 5.369	.741
Pregnancy regimen	NC	644 (94.0%)	883 (95.2%)	.315
	NC-COS	41 (6.0%)	45 (4.8%)
Endometrial thickness (mm)		10.117 ± 1.8089	10.000 ± 1.6571	.181
Endometrial type	A	45 (6.6%)	67 (7.2%)	.611
	B	640 (93.4%)	861 (92.8%)

NC = natural cycle, NC-COS = the controlled ovulation stimulation protocol for the natural cycle.