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

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

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