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The objective of this study was to assess the validity of two questions about the perception of intensity of exposure to secondhand smoke (SHS) at home using as a reference environmental markers (airborne nicotine and benzene) and biomarkers of exposure (cotinine in saliva and urine). This was a cross-sectional study in a convenience sample of 49 non-smoking volunteers. We found a high correlation between self-reported SHS exposure and airborne nicotine (rsp = 0.806, p < 0.05), salivary cotinine (rsp = 0.752, p < 0.05), and urinary cotinine (rsp = 0.626, p < 0.05). We did not find differences between the score question and the conventional ones (p > 0.05). In conclusion, the significant correlation of the two questions proposed with environmental markers and personal markers indicates their potential validity to assess exposure to SHS at home.
Martínez-Sánchez, J. M., González-Marrón, A., Martín-Sánchez, J. C., Sureda, X., Fu, M., Pérez-Ortuño, R., … Fernández, E. (2018). Validity of self-reported intensity of exposure to second-hand smoke at home against environmental and personal markers. Gaceta Sanitaria, 32(4), 393–395. https://doi.org/10.1016/j.gaceta.2017.08.002