A geometric mean for a sample of n individuals is calculated by multiplying all their values and taking the nth root. However, there was an absence of information on the trend over this period and we were keen to know if there had been a change in the proportion of non-smokers who had ‘zero’ exposure to second-hand smoke.
The results were fascinating.
Exposure to second-hand smoke had indeed fallen cambodia rcs data as expected when the 2006 smoking ban was implemented. However, was that there had been continuing reductions in recent years as the message that smoking indoors and at home and causing others to breathe your cigarette smoke was no longer socially acceptable. This was good evidence that targeted campaigns such as ‘Take it Right Outside’ were having the desired effect.
But what really caught our eye was that the proportion of non-smoking adults with ‘zero’ exposure had increased from one in eight in 1998 to more than four out of every five adults by 2016 (Figure 1); reminding us of the review on how scientists should handle ‘non-detects’.