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. Author manuscript; available in PMC: 2009 Aug 3.

Published in final edited form as: J Occup Environ Hyg. 2009 Jul;6(7):396–403. doi: 10.1080/15459620902914349

TABLE VII.

Actual vs. Predicted Elemental Carbon Values for Yard Background in µg/m³

	First Visit			Second Visit

	Actual^A	Predicted	Absolute Difference	Actual	Predicted	Absolute Difference
Milwaukee	0.13	0.10	0.01 (8%)	0.38	0.21	0.09 (24%)
Philadelphia	0.60	0.45	0.01 (2%)	0.70	0.65	0.17 (24%)
Columbus	0.64	0.43	0.06 (9%)	0.86	0.30	0.46 (53%)
Phoenix	0.77	0.26	0.42 (55%)	1.44	0.32	1.01 (70%)
Portland	0.38	0.41	0.18 (47%)	0.46	0.35	0.01 (2%)
Denver	0.60	0.40	0.07 (12%)	0.84	0.26	0.49 (58%)
Average	0.52	0.46	0.13 (35%)	0.78	0.47	0.37 (47%)

Note: The difference as a percentage of the actual value is given in parentheses.

^A

Actual values represent the observed medians for each trip.