Table 2.

Incidence rate ratio of TB in patients with SNV according to the interval after diagnosis.

	Total
After diagnosis	# of Events	PY	IR/1,000 PY (95% CI)	Crude IRR (95% CI)	Adjusted IRR (95% CI)¶
TB <3 months	16	613.83	26.07 (15.29–41.00)	9.59 (4.89–18.81)	8.90 (4.52–17.53)
3 months ≤ TB <6months	10	553.74	18.06 (9.05–31.67)	6.63 (3.06–14.37)	6.27 (2.89–13.61)
6 months ≤ TB <12 months	7	1,008.50	6.94 (2.98–13.42)	2.55 (1.07–6.11)	2.44 (1.02–5.84)
TB ≥12 months	18	6,620.78	2.72 (1.65–4.17)	1.00 (Ref)	1.00 (Ref)

^¶IRR was calculated by adjusting for age and sex.

TB, tuberculosis; SNV, systemic necrotizing vasculitides; PY, person-years; IR/1,000 PY, incidence rate/1,000 person-years; CI, confidence interval; IRR, incidence rate ratio.