Table 1.

The number of AR CAG repeats in patients with rheumatoid arthritis (RA) and controls.

	RA			Controls
Alleles	n	Mean ± SD	Median (min–max)	n	Mean ± SD	Median (min-max)	p^†
All^*	650	22.1 ± 2.9	22 (11–34)	476	21.9 ± 2.9	22 (12–30)	0.26
Shorter	325	20.5 ± 2.3	20 (11–28)	238	20.4 ± 2.2	20 (12–28)	0.42
Longer	325	23.6 ± 2.6	24 (16–34)	238	23.4 ± 2.6	23 (17–30)	0.42
Mean^**	325	22.1 ± 2.1	22 (15.5–28.5)	238	21.9 ± 2.1	22 (16.5–28)	0.39

↵* Shorter and longer alleles analyzed together.
↵** Formula: (shorter allele CAG repeats + longer allele CAG repeats)/2.
↵† Mann-Whitney U test.