Table 1.

Number of reads mapped on chromosome and mitochondria

Chromosomes	Length	No. of mapped read	Coverage depth
chr1	315 321 322	36 066 872	22.88
chr10	79 102 373	10 082 900	25.49
chr11	87 690 581	9 493 566	21.65
chr12	63 588 571	8 102 671	25.48
chr13	218 635 234	24 881 777	22.76
chr14	153 851 969	18 450 782	23.99
chr15	157 681 621	17 694 137	22.44
chr16	86 898 991	12 822 395	29.51
chr17	69 701 581	7 918 578	22.72
chr18	61 220 071	7 231 438	23.62
chr2	162 569 375	19 587 407	24.10
chr3	144 787 322	18 579 558	25.66
chr4	143 465 943	16 509 729	23.02
chr5	111 506 441	12 374 349	22.19
chr6	157 765 593	20 352 689	25.80
chr7	134 764 511	15 332 343	22.75
chr8	148 491 826	16 507 284	22.23
chr9	153 670 197	18 647 490	24.27
chrMT	16 613	21 881	263.42
chrX	144 288 218	16 378 812	22.70

Six cell‐free DNA samples were analyzed, and total read number of the 6 samples were presented.