Table 2.

Correlation between CA-125 and progesterone levels to the other study parameters

	CA-125 level		Progesterone level
	R	P value	R	P value
Age	-0.029	0.774	0.090	0.374
Gestational age	0.072	0.475	0.382	<0.001*
CRL	0.035	0.739	0.407	<0.001*
GSD	-0.042	0.680	0.521	<0.001*
FHR	-0.414	<0.001*	0.363	<0.001*

*; Significant difference (P<0.05), CRL; Crown-rump length, GSD, Gestational sac diameter, FHR; Fetal heart rate and CA-125; Cancer antigen-125.