. 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 V.

Median Values for Initial and Second Visits of Model Covariates

	Philadelphia		Columbus		Milwaukee		Phoenix		Portland		Denver

	First	Second	First	Second	First	Second	First	Second	First	Second	First	Second
Terminal Size^A	8.0	—	17.9	—	18.2	—	33.0	—	14.0	—	12.0	—
Industrial^A	24.5	—	23.3	—	25.8	—	12.6	—	37.9	—	27.3	—
P&D Drivers	76	66	36	39	52	51	49	75	52	57	52	61
Relative Humidity (%)	42.7	47.9	79.1^B	48.6	81^B	63.3	9.8^B	18.4	50.5	60.7	52.5	52.4
Temperature (°)	2.8^B	10.3	0.9^B	11.3	8.7^B	14.9	36	33.2	23.9^B	19.1	20.3^B	21.1
Wind speed (kph)	12.5^B	8.4	8.8	12.2	21.2^B	14.7	13.3	11.3	10.9^B	12.5	10.6^B	14.4

Terminal size and industrial land use around a terminal did not change across the two periods.

Significant differences (p < 0.05) in median values using Wilcoxon Ranksum nonparametric comparison test.