Worker performance and ventilation: Analyses of individual data for call-center workers Page: 4 of 7
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H
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Differential C02, ppm
Figure 1: ACO2 category coefficients for talk model.cdt
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Ventilation rate, 1/s-m2
Figure 2: Ventilation category coefficients for talk model.
The model with ACO2 categories predicts that agents take 8.5% longer to talk at maximum
occupancy than at minimum occupancy (p=0.05). The model with ventilation categories
predicts that they take 4% longer (p=0.36). The models predicts that agents performed the talk
task 4.0% and 4.3% slower after the software upgrade (p=0).
The models of wrap-up time showed no statistically significant association between wrap-up
time and differential ACO2 or ventilation rate. They did show an association between wrap-up
time and temperature, NETS, and shift length.
Figure 3 shows the coefficients of the temperature categories for the wrap-up model
containing ACO2 categorical variables. The baseline is 23 C. The boundaries between the
categories are 21.7, 22.5, 23.5, 24.5, and 25.4 C. The p-values for the coefficients are 0.89,
0.26, 0.91, 0.98, and 0.0028. The model with ventilation rate categories also predicts lower
performance at high temperature.S
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Federspiel, C. C.; Liu, G.; Lahiff, M.; Faulkner, D.; Dibartolomeo, D. L.; Fisk, W. J. et al. Worker performance and ventilation: Analyses of individual data for call-center workers, report, April 1, 2002; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc736285/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.