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NAQC Newsroom: Research

Do Point Prevalence and Prolonged Abstinence Measures Produce Similar Results?

Monday, July 26, 2010  
Do Point Prevalence and Prolonged Abstinence Measures Produce Similar Results in Smoking Cessation Studies? A Systematic Review.
Hughes JR, Carpenter MJ, Naud S. Nicotine Tob Res. 2010 Jul;12(7):756-62. Epub 2010 May 26.

This study examined whether and how prolonged abstinence (PA) rates (i.e., not smoking since a quit date, with or without a grace period) or point prevalence (PP) abstinence rates (i.e., no smoking one or more days prior to the follow-up) are related in published studies. Findings indicate that PA and PP are closely related and can be used interchangeably with moderate accuracy. When odds ratio and relative risk are used as effect sizes, both measures produce similar effect sizes. PA produces a smaller effect size than PP when absolute differences in percent abstinent are used. The authors conclude that trials should continue to report both PA and PP outcomes to enhance comparisons across studies.

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