Table 3 Correlation between PM2.5 and carbon monoxide.

From: Waterpipe cafes in Baltimore, Maryland: Carbon monoxide, particulate matter, and nicotine exposure

Venue ID a

n

Correlation coefficients PM 2.5 and CO

1

462

0.77

2

183

0.87

3

173

0.72

4

—

—

5

218

0.97

6

173

0.77

7

—

—

  1. n=number of observations.
  2. — Both PM2.5 and CO values were missing.
  3. Spearman correlation coefficient; all P-values were <0.001.
  4. aFor venues 1 and 3, data from multiple visits included.
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