表 2. Comparison of detection rates of chromosomal aberrations among different age groups.

各年龄段异常数检出率比较

Age/yr.	n	Chromosomal abnormalities/case (%)	P	Aneuploidies/case (%)	P	p/lpCNVs/case (%)	P
p/lpCNVs: Pathogenic or likely pathogenic copy number variations. *P<0.05, vs. older than the certain age group.
35	850	11 (1.29)	0.079	3 (0.35)	0.018*	8 (0.94)	0.971
≤36	1 633	29 (1.78)	0.312	10 (0.61)	0.013*	19 (1.16)	0.237
≤37	2 401	43 (1.79)	0.143	15 (0.62)	<0.000 1*	28 (1.17)	0.066
≤38	2 782	48 (1.73)	0.017*	19 (0.68)	<0.000 1*	29 (1.04)	0.319
≤39	3 061	52 (1.70)	0.001*	22 (0.72)	<0.000 1*	30 (0.98)	0.695
≤40	3 288	57 (1.73)	<0.000 1*	25 (0.76)	<0.000 1*	32 (0.97)	0.911