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Table 9 Differences in exhaled CO at T1 and T2 in the total sample and in the current smokers group

From: A pilot study with early adolescents: dealing with diet, tobacco and air pollution using practical experiences and biological markers

Exhaled CO T1 T2
Total sample (N = 258) 0.86 (SD 1.73) 0.68 (SD 1.91)
Current smokers (N = 43) 3.09 (SD 1.36) 3.92 (SD 1.52)