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Table 1 Clinical and demographic characteristics of the study subjects

From: Changes in DNA methylation at the aryl hydrocarbon receptor repressor may be a new biomarker for smoking

N   107
Age (years)   22.0 ± 1.3
Self-reported smoking status Never 49
Waves 1 to 3 only 23
Wave 4 35
Average cigarette consumption in wave-4 smokers   8 ± 7 per day
Pack year history in wave-4 smokers ≤1 pack year 24
1 to 2 pack years 5
>2 pack years 6
Serum cotinine levels (ng/ml) <1.0 43
1 < x < 2.0 0
>2.0 ng/ml 64
Average cotinine level in those with cotinine >2 ng/ml   80 ± 58