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Occup Environ Med 62:18-27 doi:10.1136/oem.2004.015966
  • Original article

Task based exposure assessment in ergonomic epidemiology: a study of upper arm elevation in the jobs of machinists, car mechanics, and house painters

Table 7

 Mean daily exposure, exposure variability in the job, and results of linear regression analyses of measured on task based individual mean job exposures according to number of days with data collection per subject for house painters

Exposure variables Data collection days/subject Direct measurements Regression results
mean sS2 ρ2 α β
sS2, variance between measured individual mean job exposures; ρ2, squared correlation coefficient; α, intercept; β, slope.
% time >90° 1 7.6 25.2 0.09 −0.46 0.96
2 8.2 29.6 0.03 4.15 0.45
3 8.5 25.5 0.00 7.93 0.06
4 8.8 24.5 0.00 8.65 0.02
% time >90° at least 5 s 1 4.8 16.4 0.08 0.03 0.87
2 5.3 19.7 0.04 2.42 0.49
3 5.5 15.8 0.01 4.20 0.22
4 5.8 15.7 0.01 4.46 0.21

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