Table 2. Demographic variables according to pregnancy outcomes.

Variables	Non-pregnancy (n=187)	Chemical pregnancy (n=12)	Clinical abortion (n=18)	Ongoing pregnancy (n=67)	P value
Age (yr)	36 (33–41)	37 (34–38.8)	37 (35–38.8)	34 (33–36)	0.001
Progesterone (ng/mL)	21.9 (16.6–28.5)	27.4 (13.8–29.5)	63.0 (44.3–81.1)	60.0 (35–97.2)	<0.001
HCG (IU/L)	1.2 (1.2–1.2)	28.9 (11.4–61.1)	146 (102.9–201.2)	234.2 (122.2–321.2)	<0.001

Values are presented as median (interquatile range).

HCG, human chorionic gonadotropin.