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. Author manuscript; available in PMC: 2020 Nov 5.
Published in final edited form as: Thorax. 2019 Jan 19;74(3):237–246. doi: 10.1136/thoraxjnl-2018-211845

Figure 1.

Figure 1

Infants with cystic fibrosis (CF) have disproportionately high secondhand smoke exposure. CF hair nicotine concentrations were determined by high-performance liquid chromatography-tandem mass spectrometry and plotted by age grouping (infants<1 year, children 1–5 years, children≥5 years). P=0.006 for infants vs children 1–5 years, p=0.002 for infants vs children≥5 years, via t-tests. Analysis of variance p=0.002. Nicotine concentrations were inversely correlated with age (r=−0.33, p=0.011, Pearson’s correlation coefficient), n=57. As a reference, active smokers have been reported to have median hair nicotine concentrations of 16.2 ng/mg hair.