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. 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 (%)
% 1/x
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.