. 2014 Jul 24;3(3):809–837. doi: 10.3390/jcm3030809

Table 8.

Prevalence of mosaic trisomy 7 in chorionic villi and UPD7 in the fetus.

Study	Total No. of CVS sample	No. of CVS samples with trisomy 7	Prevalence of trisomy 7 in CV		No. of TFM with trisomy 7 after a mosaic in CV	No. of cases with UPD investigation	No. of UPD7 retrieved	Incidence of UPD in mosaic trisomy 7 in CV (%)
Study	Total No. of CVS sample	No. of CVS samples with trisomy 7	%	1/x	No. of TFM with trisomy 7 after a mosaic in CV	No. of cases with UPD investigation	No. of UPD7 retrieved	Incidence of UPD in mosaic trisomy 7 in CV (%)
Wolstenholme, 1996	66,129	60	0.09	1102	na	na	na	na
Hahnemann and Vejerslev, 1997	92,246	32	0.03	2883	0	na	na	na
Sachs et al., 1990	3000	5	0.17	600	0	na	na	na
Kalousek et al., 1996	na	na	na	na	na	14	1	7.1
Present Study *	52,673	73	0.14	722	0	62	0	0
Total	214,048	170	0.08	1259	0	76	1	1.3

* Including cases published in Grati et al., 2006; na = not available.