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Table 1 Variables from the TEBA database used in this study

From: Public health implications of changing patterns of recruitment into the South African mining industry, 1973–2012: a database analysis

Variable on database Comment or further description Derived Variables
Unique key TEBA randomly assigned no. (Not personal ID number).  
Date of birth   Age
Racial ascription Four category classification formalised under apartheid, and in continuing usage for some official purposes – Asian, black, coloured, white.  
Origin Country and district/region/province of office at which recruited or registered for a given contract. Origin at first contract on the database
Contract start date   Number of contracts.
Start date of first contract.
Start dates of returning contract.
Contract end date   End date of first contract.
End dates of returning contract.
Contract duration (days) Difference between contract end date and contract start date. Cumulative service across all contracts.
Contract duration (months) Days or weeks rounded up or down to the nearest whole number of months, e.g. 35 days = 1 month. Cumulative service across all contracts.
Commodity sector Gold, platinum group metals, coal, “other” (antimony, asbestos, chrome, copper, diamond, granite, iron, lead, lime, tin, vanadium)a . Commodity sector of longest cumulative service for an individual.
Occupational risk category Underground, “surface risk”, “surface non-risk”. Surface definition based on exposure to hazardous airborne agents. Occupational risk category of longest cumulative service for an individual
Employment status Mine employee versus “contractor”. See text for further definition. Exclusively mine employee versus contractor “ever” on TEBA database
  1. aIncludes unassigned employees recorded as “Medical”, “Security”, “Training” and “Sundry”