Table 3 Incidence of malignant lymphoma (95% CI) and number of lymphoma cases in 6604 Swedish patients with RA starting treatment with anti-TNF therapy 1998 to July 2006, follow-up for lymphoma to 2006

Year of first anti-TNF treatment start	Time since first start of anti-TNF treatment in years
Year of first anti-TNF treatment start	<1	1–2	2–4	4+
1998–2001	161 (43 to 412), 4	82 (9.9 to 295), 2	125 (46 to 273), 6	122 (50 to 252), 7
2002–3	55 (1.4 to 307), 1	111 (14 to 402), 2	68 (8.3 to 247), 2	0 (0 to 1217), 0
2004–6	44 (1.1 to 245), 1	57 (1.5 to 319), 1	0 (0 to 571), 0	–, –

RA, rheumatoid arthritis; TNF, tumour necrosis factor.