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Table 6 Median delay times stratified by smear results and adjusted Pos-to-Neg HRs over ten years

From: Trend in risk of delay in diagnosis of new pulmonary tuberculosis in Northwest China from 2008 to 2017

Year

Smear positive

Smear negative

Adjusted Pos:Neg (HR, 95%CI)

P

N (%)

Median delay time (IQR)

N (%)

Median delay time (IQR)

2008

518

61 (33–122)

777

58 (31–88)

0.77 (0.69–0.86) *

<0.001

2009

551

43 (17–93)

1022

32 (15–70)

0.83 (0.74–0.93) *

0.001

2010

628

36 (17–70)

820

33 (17–66)

0.92 (0.83–1.02) *

0.124

2011

599

29 (14–59)

882

29 (15–59)

0.98 (0.88–1.09) *

0.742

2012

340

31 (14–60)

954

30 (13–58)

0.97 (0.86–1.11) *

0.693

2013

236

30 (15–61)

1023

29 (14–56)

0.91 (0.78–1.06) *

0.228

2014

169

29 (15–60)

1081

32 (15–60)

1.07 (0.90–1.26) *

0.453

2015

107

21 (12–39)

839

32 (15–62)

1.44 (1.17–1.78) *

0.001

2016

104

25 (14–62)

891

30 (13–59)

0.89 (0.72–1.10) *

0.268

2017

294

53 (20–184)

857

31 (15–62)

0.45 (0.39–0.52) *

<0.001

2008–2017

3546

36 (17–74)

9146

32 (15–62)

0.86 (0.78–0.95)†

0.002

  1. Note: “*” Adjusted for age, gender by using two-level mixed-effects survival model
  2. “†” Adjusted for age, gender and years. The estimate of variance in level 2 was 0.32 with the standard error of 0.45. An LR test comparing the model with the one-level survival model didn’t favor the random-intercept model with P > 0.05