Table 1 Characteristics of patients with immune-mediated inflammatory diseases (IMID) with (group II) or without (group I) latent tuberculosis infection (LTBI)

	Group I no LTBI	Group II LTBI
n	33	35
Age, mean (range), years	42.5 (17–82)	51 (31–79)
IMID (RA/SA/CD), no. of patients	11/10/12	18/15/2
Immunosuppressors (MTX/AZA/CT), no. of patients	16/6/18	15/1/11
Positive TST result (⩾10 mm), no of patients	0/33	30/35
Known size of TST result, no. of patients	23/33	27/35
⩽5 mm	13/23	3/27
6–10 mm	10/23	0/27
>10 mm	0/23	24/27

n, number of patients in each group; RA, rheumatoid arthritis; SA, spondylarthropathy; CD, Crohn’s disease; MTX, methotrexate; AZA, azathioprine; CT, corticosteroids (equivalent of prednisone ⩽10 mg/day); TST, tuberculin skin test.