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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 II.

Elemental Carbon Summary Statistics for Loading Dock in µg/m3

Initial Visit Second Visit Significant
DifferenceA and
Direction
Obs. Mean Median Standard
Deviation		 Obs. Mean Median Standard
Deviation
Philadelphia 20 0.76 0.69 0.37 10 1.28 1.00 1.28
Columbus 23 0.84 0.72 0.36 9 1.10 0.81 0.76
Milwaukee 24 0.32 0.24 0.28 17 0.45 0.45 0.19 +A
Phoenix 6 1.41 0.88 0.94 9 1.77 2.06 0.57
Portland 18 0.64 0.63 0.15 10 0.83 0.78 0.35
Denver 23 0.78 0.71 0.39 12 1.69 1.59 0.63 +A
Total 114 0.70 0.65 0.45 67 1.12 0.94 0.74 +A
A

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