Objective-This study examined the validity of child-reported exposure to secondhand smoke (SHS) and investigated factors, such as child's age, that might affect accuracy of recall.Study Design and Setting-Participants were drawn from a nonprobability sample of 380 families who completed baseline assessment as part of a randomized trial of a SHS reduction intervention conducted in an urban setting in Southern California. Parents and children (aged 8-13 years) retrospectively reported child's exposure to SHS using timeline follow-back methodology; reports were compared to child's urine cotinine. Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Results-Validity coefficients for parents and children were comparable (r = 0.58 vs. r = 0.53) but parents recalled three times more exposure than children (2.2 vs. 0.8 cigarettes per day; p < 0.001).
NIH Public AccessRegression models predicting cotinine indicated that including child in addition to parent reports resulted in better prediction than either alone.Conclusion-When there is a choice, parent reports are preferable over child reports due to decreased underreporting. However, child-reported SHS exposure had adequate validity (r > 0.50) and might be appropriate in some situations. Researchers might consider collecting both parent and child reports, since each made a unique contribution to the prediction of cotinine.