. Author manuscript; available in PMC: 2023 Aug 30.

Published in final edited form as: J Occup Environ Hyg. 2010 Jan;7(1):7–13. doi: 10.1080/15459620903327970

Table III.

Summary Statistics for Time-Weighted Task Concentrations and Mean Task Duration (t) for Nine Generalized Task Categories

Tasks	GM (mg/m³)	GSD	t (hr)
Weaning	0.35 a	4.50	0.87
Breeding	0.22 ab	3.58	1.42
Heat checking	0.19 abc	5.28	0.91
Feeding	0.15 bcd	4.58	0.78
Setting-up/breakdown	0.14 bcd	2.83	0.81
Treating/processing pigs	0.13 bcd	4.00	0.66
Sow/gilt handling	0.12 bcd	3.60	0.81
Recording	0.09 cd	2.04	0.44
Walking aisles	0.07 d	2.18	0.56

Note: Geometric means with the same letter are not significantly different at the α = 0.05 level.