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Table 4 Frequency and incidence of TB disease by time among 8137 contacts in the Xuhui, Changning, Minhang and Songjiang districts of Shanghai from 2010 to 2014

From: High incidence and low case detection rate among contacts of tuberculosis cases in Shanghai, China

Follow-up time (year)

No. of contacts

Observed pys

TB cases

Cumulative incidence /100,000

95% CI

Incidence density /100,000 pys

95% CI

0–1

8137

7538

35

430

300–598

464

323–646

1–2

6599

5844

13

197

105–337

222

118–380

2–3

4945

4213

14

283

155–475

332

182–558

3–4

3328

2514

3

90

19–263

119

25–349

4–5

1638

866

4

244

67–624

462

126–118

5–5.25

146

16

0

0

–

0

–

Total

8137

20,991

69

848

660–1071

329

256–416