Application of non-invasive prenatal testing to 91,280 spontaneous pregnancies and 3477 pregnancies conceived by in vitro fertilization

Table 5 Comparison of the correlation between the average FF and gestational age in the two groups

Gestational weeks	SP group		IVF group		t-text	p value
	Average FF (%)	SD	Average FF (%)	SD
12⁺⁰–15⁺⁶ (weeks)	10.95	4.14	10.67	4.04	1.26	0.21
16⁺⁰–19⁺⁶ (weeks)	11.18	4.18	10.25	4.52	4.55	< 0.05
20⁺⁰–23⁺⁶ (weeks)	11.86	4.39	12.01	5.57	− 0.14	0.89
24⁺⁰–26⁺⁶ (weeks)	13.89	4.89	15.84	4.46	− 0.97	0.33
Total (weeks)	11.23	4.22	10.51	4.36	4.77	< 0.05

ISSN: 1755-8166