BioMed Research International / 2014 / Article / Tab 1

Research Article

A Cohort Study on Self-Reported Respiratory Symptoms of Toner-Handling Workers: Cross-Sectional and Longitudinal Analysis from 2003 to 2008

Table 1

Personal exposure measurement.

Toner-handling work category1st survey2nd survey3rd survey4th survey5th survey6th survey

Toner development
 Sampling case#1917111157
 GM## (mg/m3)0.0260.0260.0140.0120.0150.011
  (GSD##)(1.974)(2.059)(1.507)(1.355)(1.069)(1.299)
 Median (mg/m3)0.0180.0200.0140.0130.0150.011
  (quartile 1, quartile 3)(0.015, 0.039)(0.015, 0.041)(0.010, 0.016)(0.011, 0.015)(0.014, 0.015)(0.009, 0.016)
Toner manufacturing
 Sampling case616572607471
 GM (mg/m3)0.0750.0640.0360.0430.0280.025
  (GSD)(3.446)(3.742)(2.963)(3.447)(2.847)(2.909)
 Median (mg/m3)0.0450.0440.0350.0230.0180.016
  (quartile 1, quartile 3)(0.032, 0.159)(0.021, 0.156)(0.014, 0.065)(0.017, 0.106)(0.014, 0.047)(0.013, 0.034)
Photocopier development
 Sampling case1012131196
 GM (mg/m3)0.0180.0160.0140.0140.0140.016
  (GSD)(1.303)(1.107)(2.210)(1.326)(1.432)(1.038)
 Median (mg/m3)0.0170.0160.0110.0150.0150.016
  (quartile 1, quartile 3)(0.016, 0.020)(0.014, 0.018)(0.009, 0.017)(0.011, 0.016)(0.010, 0.019)(0.015, 0.016)
Toner and photocopier recycling
 Sampling case232933345044
 GM (mg/m3)0.5690.2360.0750.0660.0670.029
  (GSD)(3.704)(2.562)(3.169)(2.879)(2.908)(2.638)
 Median (mg/m3)1.0540.2110.0600.0510.0650.021
  (quartile 1, quartile 3)(0.1 10, 1.420)(0.139, 0.363)(0.036, 0.137)(0.037, 0.151)(0.030, 0.126)(0.014, 0.050)
Customer service
 Sampling case182223181619
 GM (mg/m3) 0.0200.0180.0130.0130.0130.013
  (GSD)(1.308)(1.635)(1.370)(1.419)(1.391)(1.471)
 Median (mg/m3)0.0190.0160.0130.0150.0140.014
  (quartile 1, quartile 3)(0.016, 0.022)(0.015, 0.019)(0.010, 0.016)(0.009, 0.016)(0.009, 0.017)(0.009, 0.016)

Sampling case: about 5 workers in one workplace were randomly selected and conducted personal exposure measurement.
For toner manufacturing process and toner and photocopier recycling process, the workplaces were subdivided and the sampling cases increased.
On the other hand, toner development process, photocopier development process, and customer service process had a few work units.
GM: geometric mean. GSD: geomrtric standard deviation.

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