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Table 4 Sample prevalence and assumed distribution of exposed miners in Zimbabwe around 2004

From: The burden of chronic mercury intoxication in artisanal small-scale gold mining in Zimbabwe: data availability and preliminary estimates

Column A B C D E
Subgroups of artisanal small-scale gold (ASG) miners Sample prevalence of chronic mercury intoxication in ASG miners* Main analysis: Numbers and percentages**of ASG miners assumed for Zimbabwe Sources of numbers and percentages marked in bold in column C Scenario analysis: numbers and percentage distribution assumed for Zimbabwe (scenario range)
Min. Source Max. Source
Total (T) 72% (131/181) 350,000 100% [8, 9, 50, 51] No variation 500,000 [54, 55]
Adults (A)’ 72% (118/164) 297,500 85% of T GMP 2004 No variation 98% of T [14]
Males (M) 90% (95/106) 208,250 70% of A Mid-value of reported data*** 50% of A [8, 9, 50] 89% of A [52, 53]
15-24 91% (41/45) 74,350 36% of M GMP 2004 cross-checked against Mtetwa and Shava [52] No variation
25-34 88% (35/40) 86,000 41% of M
35-41 90% (19/21) 21,450 10% of M
42+ 26,450 13% of M
Females (F) 40% (23/58) 89,250 30% of A Mid-value of reported data*** 11% of A [52, 53] 50% of A [8, 9, 50]
15-24 26% (7/27) 31,860 36% of F GMP 2004 cross-checked against Mtetwa and Shava [52] No variation
25-34 52% (16/31) 36,860 41% of F
35-41 9,190 10% of F
42+ 11,340 13% of F
Children” 76% (13/17) 52,500 15% of T GMP 2004 2% of T [14] No variation
Male (M) 38,500 11% of T
Female (F) 14,000 4% of T
  1. *The data were taken from the Global Mercury Project (GMP), conducted by UNIDO in Zimbabwe in 2004 [5, 12], and from a health and biomonitoring project focusing on women of child-bearing age and their infants, conducted in Zimbabwe in 2006 by the University of Munich (LMU; Germany) [48]. The sample prevalence of the control group is 0%. The sample prevalence (in %) in every subgroup is determined using Formula 1, Table 1. The number of intoxicated and the subgroup size are shown between parentheses.
  2. **Numbers and percentages are rounded and include uncertainties because their distribution was derived using the estimates given in the sources in column D.
  3. ***References consulted with estimates for Zimbabwe [8, 9, 50, 52, 53] cross-checked against the GMP 2004.
  4. Adults: individuals 15 years and older.
  5. Children: individuals aged 9–14; children aged 0–8 were not assumed to be occupationally exposed.
  6. A: adults; F: females; GMP 2004: own analysis using data from the Global Mercury Project 2004 for Zimbabwe; M: males; Max.: maximum; Min.: minimum; T: total.