. Author manuscript; available in PMC: 2016 Feb 29.

Published in final edited form as: Nat Genet. 2015 May 18;47(7):727–735. doi: 10.1038/ng.3306

Table 1. Origin and incidence of maternal aneuploidies.

				Chromosome missegregation events^d
Dataset:	Mean maternal age^a	n^b	% aneuploid oocytes	All events	Aneuploid outcome in oocyte	Gain in oocyte		Loss in oocyte		Total chr
Dataset:	Mean maternal age^a	n^b	% aneuploid oocytes	All events	Aneuploid outcome in oocyte	MI	MII	MI	MII	Total chr
Oocyte-PB trios	37.3 (33-41)	13	62%	26	12	2	4	4	2	299
Embryo-PB trios	38.3	10	70%	19	8	4	1	0	3	230
Embryo only	37.1 (34-42)	29^c	54%	n.d.	19	5	4	n.d	n.d.	667

Mean age and range.

Number of trios or embryos analysed

28 embryos and 1 chorionic villus sample.

Statistical test for significance of MII nondisjunction rates in oocyte-PB and embryo-PB trios: 6 out of 299 compared to 4 out of 230, respectively, G-test with Williams’ correction, p = 0.82.

n.d., not determined since no information from polar bodies.