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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