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Table 1 Mean difference of eCO Levels among different groups 30 minutes after entering the venue

From: Comparison of end tidal carbon monoxide (eCO) levels in shisha (water pipe) and cigarette smokers

(I) respondents (J) respondents

Mean difference of eCO (ppm) (I-J)

Std. error

Sig.

Active shisha smokers

-24.20

1.10

<0.001

Passive shisha smokers

-14.83

2.43

<0.001

Active cigarette smokers

.21

.31

0.981

Active shisha smokers

-23.98

1.13

<0.001

Passive shisha smokers

-14.61

2.44

<0.001

Active cigarette smokers

24.20

1.10

<0.001

Passive cigarette smokers

23.98

1.13

<0.001

Passive shisha smokers

9.36

2.66

0.010

Active cigarette smokers

14.83

2.43

<0.001

Passive cigarette smokers

14.61

2.44

<0.001

Active shisha smokers

-9.36

2.66

0.010