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Table 1 Breath carbon monoxide (BCO) and self-reported smoking status

From: Using breath carbon monoxide to validate self-reported tobacco smoking in remote Australian Indigenous communities

BCO level (p.p.m.) Self-reported non-smokers (n) Self-reported smokers (n) in BCO range Total (n)
   0-5 p.p.m. 6-10 p.p.m. 11-15 p.p.m. >15 p.p.m.  
1 22      22
2 20 1     21
3 11      11
4 3      3
5   2     2
6    7    7
≥7 4   42 66 131 243
Total       309