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Table 1 Independent studies of prevalence of silicosis (ILO profusion 1/1) and tuberculosis using radiography from a random samplea of ex-miners who worked in South Africa

From: Tackling injustices of occupational lung disease acquired in South African mines: recent developments and ongoing challenges

Study Population & inclusion criteria Mean age in years Mean duration of employment Size of studyb Silicosis
% ± 95 CI
TB
% ± 95 CI
Both
% ± 95 CI
   (range)    (count) (count) (count)
Girdler-Brown et al., 2008 [28] Former gold miners from Lesotho 49.4 (25–61) 25.6 610 24.3% ± 3.4% (148) 30.2% ± 3.6% (184) 10.7% ± 2.5% (65)
Trapido et al., 1998 [30] Random sample of ex-miners in the Libode district 52.8 (34–78) 9.3 228 20.6% ± 5.3% (47) 32.9% ± 6.1% (75)
Steen et al., 1997 [31] Former miners from Botswana 55.7 (28–93) 13.4 101 25.7% ± 8.6% (26c) 26.7% ± 8.7% (27)
Hnizdo and Sluis-Cremer, 1993 [32] Former white gold miners, age 45–54 years, underground service of at least 10 years 52.6 (30–70) 23.5 2235 14.0% ± 1.4% (313)
Meel, 2002 [29] Former gold miners from Transkei district 51.6 (35–66+) 12.4 271 33.9% ± 5.7% (92) 61.6% ± 5.8% (167) 28.4% ± 5.4% (77)
Churchyard et al., 2004 [33] Active black gold miners over 40 years of age in the North West province 46.7 (37–59) 21.8 515 18.3% ± 3.3% (94) 19.6% ± 3.4% (101)
Average   51.5 17.7 660 17.1%d ± 1.2% 30.5%d ± 2.1% 13.7%d ± 2.2%
  1. aParticipant selection within these studies is assumed to be unbiased
  2. bExcludes any non-randomly selected participants, or participants for which no data was collected
  3. cILO profusion ≥1/0
  4. dWeighted mean is the maximum likelihood estimator of the distribution means
  5. eThe overall prevalence is psilicosis + pTB − pboth = 33.9 %  ± 3.3%