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Table 1 Baseline characteristics of the study population (n = 18,520)

From: The timing of tuberculosis after isoniazid preventive therapy among gold miners in South Africa: a prospective cohort study

Characteristic

 

Total, n (col %) a

Sex

Male

17,763 (95.9)

Age, years

≤29

2,456 (13.3)

 

30–39

4,919 (26.6)

 

40–49

7,782 (42.0)

 

≥50

3,362 (18.2)

Country of origin

South Africa

10,501 (56.7)

 

Lesotho

5,178 (28.0)

 

Mozambique

1,854 (10.0)

 

Other

979 (5.3)

Years in workforce

0–9

4,874 (26.4)

 

10–19

5,017 (27.2)

 

20–29

5,846 (31.7)

 

≥30

2,724 (14.8)

Type of work

Underground

16,821 (91.2)

Type of housing

Hostel

10,913 (58.9)

Previous TB b

 

2,212 (12.0)

Previous IPT

 

79 (0.4)

Self-reported ART use

 

521 (2.8)

  1. a Missing data (n): sex (1), age (46), country of origin (8), years in workforce (59), type of work (77), type of residence (1), previous TB (14), previous IPT (38), self-reported ART use (20)
  2. b Timing of previous TB episodes: median 4.0 years (IQR, 1.8–8.9 years), 5 had missing TB dates; 265 (12 %) episodes occurred in year prior to IPT
  3. ART, Antiretroviral therapy; IPT, Isoniazid preventive therapy; IQR, Interquartile range; N, Number; TB, Tuberculosis