Table 4. The incidence of tuberculosis in allogeneic hematopoietic stem cell transplantation recipients compared with the general population in Korea.

Transplant perioda	Duration of observation, patient-years	TB patients		SIR	95% CI	P
		Observed n (%)	Expected n
Total (n = 845)	3210.26	21 (2.49)	2.30	9.10	5.59–14.79	< 0.001
Jan. 2004-Mar. 2009 (n = 550)	2341.64	16 (2.91)	1.65	9.58	5.57–16.48	< 0.001
Apr. 2009-Mar. 2011 (n = 295)	868.62	5 (1.69)	0.64	7.73	3.13–19.13	< 0.001

TB, tuberculosis; SIR, standardized incidence ratio; CI, confidence interval.

^a Starting April 2009, patients were given isoniazid prophylaxis based on interferon-γ release assay results.