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. 2018 Jan 6;15(1):83. doi: 10.3390/ijerph15010083

Table 3.

Comparison of self-report passive exposure to cotinine values.

Self-Reported Passive Exposure
No Exposure Passive Exposure Total
Cotinine values
No Exposure (<1.0 ng/mL) 382 50 432
Passive Exposure (1–3 ng/mL) 51 20 71
Total 433 70 503

Note. Sample includes non-smokers identified by cotinine values ≤3 ng/mL who had provided self-report information about passive exposure at home and/or work.