. Author manuscript; available in PMC: 2009 Sep 24.

Published in final edited form as: Arthritis Rheum. 2009 Apr;60(4):1179–1186. doi: 10.1002/art.24418

Table 2.

Demographic and clinical characteristics of the cases and controls^*

	Cases (n = 27)	Arthritis controls (n = 54)	Vaccine controls (n = 54)	Normal controls (n = 54)
Age, mean (range) years	55.0 (41–74)	54.4 (37–77)	55.0 (39–74)	54.3 (38–74)
Female sex	16 (59)	32 (59)	32 (59)	32 (59)
Total no. of Lyme vaccine doses, no. receiving 1/2/3	3/14/10	NA	0/4/50	NA
Time since last dose, median (range) years	3.59 (2.75–5.09)	NA	5.48 (2.75–8.60)	NA
Met ACR RA criteria	14 (52)	19 (35)	NA	NA
Diagnosis of RA	16 (59)	25 (46)	NA	NA
Other arthritis diagnoses	11 (41)^†	29 (54)^‡	NA	NA

Except where indicated otherwise, values are the number (%). NA = not applicable; ACR = American College of Rheumatology; RA = rheumatoid arthritis.

^†

Eight (30%) undifferentiated arthritis; 2 (7%) osteoarthritis; 1 (4%) arthritis and scleroderma.

^‡

Seventeen (31%) undifferentiated arthritis; 6 (11%) psoriatic arthritis; 3 (6%) gouty arthritis; 1 (2%) osteoarthritis; 1 (2%) Crohn’s disease–related arthritis; 1 (2%) parvovirus-related arthritis.