. Author manuscript; available in PMC: 2011 Jul 1.

Published in final edited form as: Arthritis Rheum. 2010 Jul;62(7):1842–1848. doi: 10.1002/art.27459

Table 5.

Distribution of the RA-associated HLA shared epitope by copy number, parity and time since last childbirth in RA cases

SE copies	Nulliparous (N = 97) N (%)	All Parous^* (N = 213) N (%)	Years since last birth in parous cases
SE copies	Nulliparous (N = 97) N (%)	All Parous^* (N = 213) N (%)	≤ 1 (N = 13) N (%)	1 – 5 (N = 11) N (%)	5 – 15 (N = 49) N (%)	> 15 (N = 140) N (%)
2	28 (29)	38 (18)	1 (8)	0	7 (14)	30 (21)
1	43 (44)	98 (46)	6 (46)	6 (55)	23 (47)	63 (45)
0	26 (27)	77 (36)	6 (46)	5 (45)	19 (39)	47 (34)

A test for trend in association of shared epitope copy number and parity gave p=0.02.