Replication of British Rheumatoid Arthritis Susceptibility Loci in Two Unrelated Chinese Population Groups

Table 2

Clinical characteristics of the test and validation cohorts.

Subjects	Test cohort	Validation cohort
Number of RA cases	190	757
Number of healthy controls	190	757
Study design	Unrelated cases with individually matched controls	Unrelated cases with individually matched controls
Ethnicity	Han Chinese	Han Chinese
City of residence	Chengdu	Chongqing
Female, number (%)	300 (78.9)	1253 (82.7)
Age, mean ± SD years	46.4 ± 8.0	46.8 ± 10.2
Age at RA onset, mean ± SD years*	39.4 ± 9.6	41.0 ± 10.1
Disease duration, mean ± SD years*	6.97 ± 6.2	5.7 ± 5.4

*Refers to rheumatoid arthritis (RA) patients only.