Table 2 OR with 95% CI associated with a history of vagotomy and other gastrointestinal medical conditions or surgical procedures among 63 029 Swedish cases with rheumatoid arthritis identified in the Inpatient Register 1964–2001 and their population controls and among 2458 Swedish cases with rheumatoid arthritis identified in the Early Arthritis Register 1995–2001 and their population controls.

	Inpatient Register (cases = 63 029/controls = 125 404)			Early Arthritis Register (cases = 2458/controls = 24 357)
	Cases	Controls	OR (95% CI)	Cases	Controls	OR (95% CI)
Vagotomy or ventricular resection	179	304	1.17 (0.97 to 1.40)	10	64	1.56 (0.65 to 3.76)
Gastrorraphy	61	66	1.83 (1.29 to 2.60)	3	14	2.14 (0.48 to 9.55)
Ulcer disease	753	1233	1.21 (1.11 to 1.33)	40	312	1.29 (0.92 to 1.80)
Cholecystectomy	1458	2868	1.01 (0.95 to 1.08)	83	859	0.96 (0.77 to 1.21)