Analysis of Quality of Nuchal Translucency Measurements: Its Role in Prenatal Diagnosis

Table 1

Multiples of the median NT values, expressed as median, 5th and 95th centiles, according to the different criteria (operator, period, CRL values, FMF certification, and professional profile).

	MoM-NT
	Median	5th centile	95th centile	𝑛
Operator
Obs 1	1,00	0,68	1,63	2.364
Obs 2	0,99	0,70	1,45	585
Obs 3	1,13	0,81	1,60	294
Obs 4	1,02	0,64	1,63	905
Obs 5	1,00	0,71	1,40	79
Obs 6	0,83	0,51	1,32	168
Obs 7	0,92	0,58	1,39	51
Obs 8	0,92	0,59	1,42	1.232
Obs 9	0,87	0,41	1,53	114
Obs 10	1,03	0,71	1,68	2.517
Obs 11	0,92	0,60	1,48	2.715
Obs 12	1,04	0,68	1,69	167
Obs 13	1,00	0,64	1,50	1.571
Obs 14	0,95	0,70	1,26	225
Period
2003–2006	0,97*	0,62	1,67	5560
2007–2009	0,99*	0,67	1,50	6623
CRL (mm)
≤60	0,96*	0,64	1,61	7.62
>60	1,00*	0,65	1,50	5.467
FMF
Certified	1,00*	0,67	1,47	1.719
Noncertified	0,97*	0,64	1,58	11.368
Profile
Dedicated	0,98	0,65	1,56	11.889
Nondedicated	0,97	0,57	1,48	1.198
Overall	0,98	0,64	1,56	13.087

Obs: observer or operator.
US: scans.
FMF: Fetal Medicine Foundation.
* 𝑃<0.05 (comparison between criteria).