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Table 1 Personal total dust exposure (mg/m3) among cleaners and production workers in two cement factories in Ethiopia

From: Lung function reduction and chronic respiratory symptoms among workers in the cement industry: a follow up study

Department
  Work group Ns Nw AM GM 10-90th percentile wwδ bwδ %>TLV of 10 mg/m3
All Cleaners 168 58 2215 432 12-6710 5.2 0.02 90.5
  Production workers 94 47 56 8.2 0.7-72 2.2 1.1 48
Crusher          
  Cleaners 44 16 2202 313 6-6600 7.0 0.0 84
  Production workers 24 12 5.2 2 0.6-19 1.3 0.0 8.3
Packing          
  Cleaners 31 11 1039 348 24-3280 3.2 0.0 97
  Production workers 33 18 35 26 7.7-76 0.6 0.05 88
Kiln          
  Cleaners 37 13 3310 419 8-10200 6.1 0.7 86.5
  Production workers 21 10 161 6 0.4-1130 5 0.4 24
Raw mill          
  Cleaners 56 18 2153 641 31-7160 3.8 0.1 94.6
  Production workers 16 7 37 9.2 0.5-147 2.2 2.2 56.3
  1. Notes: Ns: Number of samples; Nw: Number of workers; GM: Geometric mean; AM: Arithmetic mean; wwδ: Within worker variance; bwδ: Between worker variance; Production workers: operators, belt attendants, kiln and cooler attendants, raw mill attendants, dumper operators, packers, loaders; % > TLV: Percentage of samples higher than the threshold limit value of 10 mg/m3 for total dust