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Table 1 Baseline characteristics of sputum smear-positive pulmonary tuberculosis (PTB) cases in Eden District, Western Cape Province, 2007–2013

From: Risk factors for tuberculosis smear non-conversion in Eden district, Western Cape, South Africa, 2007–2013: a retrospective cohort study

Variables

All PTB cases

PTB cases with smear resultsa

PTB cases without smear resultsa

 

n

%

n

%

n

%

p value

Age, years, mean (SD)

36 ± 12.8

-

35 ± 13.1

-

37 ± 12.3

 

p < 0.0001

Gender

      

p < 0.0001

 Female

7556

39.35

5130

40.26

2424

37.56

 

 Male

11,641

60.65

7612

59.74

4029

62.44

 

HIV status

      

p < 0.0001

 Negative

13,086

68.17

9047

71.00

4039

62.59

 

 Positive

4256

22.17

2720

21.35

1536

23.80

 

 Unknown

1853

9.65

975

7.65

878

13.61

 

Disease classification

    

p = 0.061

 PTB

19,024

99.11

12,640

99.20

6384

98.93

 

 PTB and EPTB

171

0.89

102

0.80

69

1.07

 

 TB classification

      

p < 0.0001

 New

12,833

66.86

10,574

82.99

2259

35.01

 

 Re-treatment

6362

33.14

2168

17.01

4194

64.99

 

Smear conversion statusa

     

 Negative

11,115

87.23

11,115

87.23

-

-

 

 Positive

1627

12.77

1627

12.77

-

-

 

Pre-treatment smear grading

   

p = 0.053

 Scanty

1670

8.70

1101

8.64

569

8.82

 

 AFB+

3991

20.79

2665

20.92

1326

20.55

 

 AFB++

3983

20.75

2659

20.87

1324

20.52

 

 AFB+++

8575

44.67

5712

44.83

2863

44.37

 

 Not recorded

976

5.08

605

4.75

371

5.75

 

Sub-district

      

p = 0.887

 Bitou

1662

8.66

1119

8.78

543

8.41

 

 George

7101

36.99

4731

37.13

2370

36.73

 

 Hessequa

1245

6.49

818

6.42

427

6.62

 

 Kannaland

940

4.90

615

4.83

325

5.04

 

 Knysna

2088

10.88

1388

10.89

700

10.85

 

 Mossel Bay

3090

16.10

2028

15.92

1062

16.46

 

 Oudtshoorn

3069

15,99

2043

16.03

1026

15.90

 
  1. SD Standard deviation, TB tuberculosis, AFB Acid fast bacilli, PTB Pulmonary TB, EPTB Extra-pulmonary TB
  2. asputum smear results at the end of 2- or 3- month intensive phase of treatment