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Table 4 Age and employment characteristics of miners recorded on the TEBA database, 1973–2012

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

Characteristic Median Mean Interquartile range 1st- 99th percentile Na
Age at entry (yrs) 25 27.9 22–32 17–56 1,625,053
No. of contracts 4 6.3 1–9 1–26 1,625,053
Length of first contract (days) 365 669 350–429 8–5917 1,624,372
Length of returning contract (days) 365 448 357–392 8–3249 8,676,738
Cumulative employment – days (yrs) 2291 (6.3) 3062 (8.4) 732–4412 (2.0–12.1) 8 - 11,674 (0.02–40.0) 1,624,981
Average cumulative service by commodity – days (yrs)b
 Gold 2359 (6.5) 3093 (8.4) 755 to 4450 (2.1–12.2) 8 - 11,787 (0.02–32.3) 1,223,152
 Platinum 1095 (3) 1787 (4.9) 367–2526 (1.0–6.9) 8–9013 (0.02–24.7) 392,806
 Coal 1720 (4.7) 2441 (6.7) 366 to 3205 (1.0–8.8) 1 to 10,578 (0–29.0) 60,833
 Other 374 (1.0) 838 (2.3) 365–911 (1.0–2.5) 0–5989 (0.02–16.4) 178,426
  1. aVariation in totals due to exclusion of contracts with erroneous data, mainly termination date occurring before registration date. (Additional file 1 Supplementary note 1)
  2. bAll service days included here, irrespective of whether the miner worked in one or multiple sectors
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