Table 1 Rates of active tuberculosis and time to diagnosis for contacts of index cases in congregate settings.

From: Risk of active tuberculosis development in contacts exposed to infectious tuberculosis in congregate settings in Korea

Months After Notification Index Case

Contacts with TB, No.

(Cumulative %a)

No. of Contacts

Person-Years of Observation, No.

Cumulative Incidence/100,000

(95% CI)

Incidence Rate/100,000b

(95% CI)

Total

499

 

116,742

340,961

427

(391.2–467.0)

146

(133.5–159.2)

0–3

119

(23.8)

116,623

28,769

102

(84.9–122.5)

414

(339.3–488.0)

4–6

85

(40.9)

116,538

28,744

73

(58.6–90.6)

296

(232.9–358.6)

7–9

50

(50.9)

116,488

28,726

43

(32.1–57.0)

174

(125.8–222.3)

10–12

48

(60.5)

116,440

30,312

41

(30.7–55.1)

158

(113.6–203.1)

13–24

102

(81.0)

116,338

116,390

88

(71.8–106.9)

88

(70.6–104.6)

25–42

95

(100)

9,958

108,020

954

(776.6–1,170.0)

88

(70.2–105.6)

  1. TB, tuberculosis; CI, confidence interval.
  2. aCalculated as the proportion of all contacts with tuberculosis (denominator, 499).
  3. bIncidence rate in cases per 100,000 person-years observation.
Back to article page