Table 2.

Screening performance of our study in 2007–2011 compared to three other studies.

	FASTER	SURUSS	DENMARK	FINLAND
N	36 120	39 983	54 830	31 147
Mean maternal age	27.1	NA	30.3	29.4
≥35 years %	13.2	NA	NA	15.3
Down’s N	92	85	104	83
Down’s prevalence	1:329	1:470	1:404	1:375
Detection rate %	77	83	82	77.1
False-positive rate %	5	5	3.5	2.8
Number of invasive procedures needed to detect one case of Down’s syndrome	22	29	18.5	11