Table 1.

Mean of gestational age, weight and maternal age in different groups of patients based on the levels of free βHCG MoM.

free βHCG MoM		Gestational age (day)	P value	Weight	P value	Age	P value
< 0.2	Mean	75.3	0.238	69.1	0.047	31.2	0.048
	N	832		820		832
	Std. deviation	3.8		13.8		5.8
0.2–5	Mean	75.5		75.9		33.8
	N	7494		2394		7521
	Std. deviation	3.6		14.9		6.4
> 5	Mean	75.3		70.5		30.6
	N	1447		1091		1243
	Std. deviation	3.6		31.0		5.7
Total	Mean	75.4		73.2		33.2
	N	9773		4305		9596
	Std. deviation	3.6		27.8		6.4