Table 1.

A Comparison of Autosomal Chromosomes to the X and Y Chromosomes

Chr	Size Chr (bp)a	Genes per Chrb	Associations in GWAS Catalogc	Loci in GWAS Catalog
1	249,250,621	3536	260	49
2	243,199,373	2346	248	47
3	198,022,430	1924	136	41
4	191,154,276	1470	118	28
5	180,915,260	1615	141	32
6	171,115,067	2054	309	37
7	159,138,663	1880	120	33
8	146,364,022	1317	123	24
9	141,213,431	1522	110	29
10	135,534,747	1457	147	32
11	135,006,516	2149	197	29
12	133,851,895	1706	176	34
13	115,169,878	703	50	18
14	107,349,540	1526	60	20
15	102,531,392	1272	99	23
16	90,354,753	1344	119	21
17	81,195,210	1770	94	19
18	78,077,248	546	52	12
19	59,128,983	2085	109	13
20	63,025,520	884	67	15
21	48,129,895	449	28	7
22	51,304,566	855	62	10
X	155,270,560	1669	15	9
Y	59,373,566	426	0	0
	Avg bp	Avg Genes	Avg Associations	Avg Loci
	128,986,559	1521	118	24

The comparison considered chromosome size in base pairs, number of genes per chromosome, number of associations in the NHGRI GWAS Catalog (p ≤ 5 × 10⁻⁸), and number of loci in the NHGRI GWAS Catalog.

^aThe UCSC Genome Browser (Human Feb. 2009 [GRCh37/hg19] assembly) was used for assessing chromosome size in bp.

^bThe NCBI Map Viewer build 37.2 was used for genes assessing per chromosome.

^cGWAS Catalog results are for the period through 12/2011. p ≤ 5 × 10⁻⁸.