Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco
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This study examined the within-subject variability of urinary cotinine levels in young children (aged = 0.6-7.2 years) of smoking parents to determine the number of urine samples needed to provide accurate estimates of exposure to environmental tobacco smoke (ETS) for different time intervals. Secondary analyses were conducted of five independent studies (N = 376), in which multiple urinary cotinine measures had been collected over time periods up to 13 months. Over measurement periods of 4-15 days, the within-subject cotinine levels varied 3-5 times more than would be expected based on measurement error alone. ⋯ To achieve similarly precise estimates of the mean cotinine level of an individual child over 4-15 days, up to nine urine samples may be necessary. Up to 12 urine samples may be required to achieve similarly precise estimates of ETS exposure over a 4- to 13-month period. Epidemiologic and clinical research on ETS exposure in children can benefit from multiple urine samples (a) to accurately measure average exposure at the level of the individual child, (b) to describe temporal patterns, (c) to detect incidences of peak exposure that would remain underrecognized if monitoring is limited to a single time point, and (d) to establish stable baseline levels and endpoints based on urine samples collected over clinically relevant time periods.
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A growing number of cities and counties in Minnesota have adopted policies or ordinances that restrict tobacco in outdoor locations. Current policies banning or limiting tobacco use on park and recreation grounds exist in at least 70 communities around Minnesota. However, little is known about the support for such policies. ⋯ Recreation directors in cities without a policy expressed a high level of concern over enforcement issues (91%), but few problems were reported (26%) in communities with a tobacco-free park policy. Broad support for tobacco-free park policies exists among the public at large and among park and recreation directors who work in tobacco-free parks. Fears of policy difficulties among park and recreation directors who work in parks without a tobacco-free policy are much greater than actual problems experienced in Minnesota tobacco-free park areas.