TY - JOUR T1 - Are there socioeconomic differentials in under-reporting of smoking in pregnancy? JF - Tobacco Control JO - Tob Control SP - 434 LP - 434 DO - 10.1136/tc.12.4.434 VL - 12 IS - 4 AU - H Graham AU - L Owen Y1 - 2003/12/01 UR - http://tobaccocontrol.bmj.com/content/12/4/434.abstract N2 - Self reported smoking status is the primary measure of smoking status for research and policy, providing both a cheaper and more widely accepted indicator than biochemical validation. It is employed in observational studies where analyses seek to explain how socioeconomic background exerts an influence on smoking behaviour. Self report is used, too, for evaluating the effects of population based tobacco control policies and for assessing progress against national and state level targets to reduce smoking prevalence.For the general population, self reported measures have been found to provide reliable estimates of smoking status when cotinine validated,1,2 without systematic differentials in under-reporting by socioeconomic group.3,4 However, self report is a less reliable measure for the pregnant population, where smokers can feel under greater pressure to describe themselves as non-smokers. For this population, validated … ER -