Table 1.

Distribution of chromosomal anomalies revealed by the two rounds of QF-PCR in early pregnancy losses in the intervention and control groups.

Chromosomal anomalies	Intervention group		Control group
	N	Frequency (%)	N	Frequency (%)
Trisomy 7	6	3	1	2
Trisomy 13	18	8	5	11
Trisomy 15	26	11	7	15
Trisomy 16	37	16	7	15
Trisomy 18	4	2	3	7
Trisomy 21	24	10	5	11
Trisomy 22	39	17	4	9
Monosomy 21	5	2	0	0
Monosomy X	33	14	7	15
Triploidy	25	11	4	9
Double anomaly	9	4	3	7
Mosaicism	5	2	0	0
Complete mole	3	1	0	0
Total	234	100	46	100