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Maternal cotinine level during pregnancy and birthweight for gestational age

Record type: Article

Background Recent studies have found that cotinine is a better predictor of birthweight than the number of cigarettes smoked in pregnancy. In this paper we test this hypothesis and use cotinine to explore the effect of environmental tobacco smoke (ETS) on birthweight. Methods In all, 1254 white women were interviewed at booking, 28 and 36 weeks about the number and brand of cigarette smoked. Cotinine was assayed from blood samples taken on the day of interview. The outcome was birthweight for gestational age. Results There was good agreement between self-reported smoker/non-smoker status and maternal cotinine with 1.3% women mis-reported as non-smokers at booking, 0.6% and 1.8% mis-reported at 28 and 36 weeks respectively. Among smokers, cotinine was more closely related to birthweight than the number of cigarettes smoked at all three time points (r = -0.25 versus r = -0.16 at booking). A reduction in cotinine between booking and 28 weeks was associated with increased birthweight but the effect was not statistically significant. Among non-smokers the association between birthweight and cotinine was not statistically significant after adjusting for maternal height, parity, sex and gestational age. Difference in mean birthweight between non-smokers in the lower and upper quintiles of cotinine was 0.2% (95% CI: -2.4, 2.8). Pooling the results of 10 studies plus our own gave an estimated difference in mean birthweight between women unexposed and exposed to passive smoke of 31 g (95% CI: 19, 44). Conclusions Cotinine is a better predictor of birthweight than the reported number of cigarettes smoked. If biochemical analysis is impossible, then self-reported smoking habit should be obtained prospectively using a structured approach. Any effect on birthweight of maternal passive smoking during pregnancy is small compared with the effects of maternal active smoking.

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Citation

Peacock, Janet L., Cook, Derek G., Carey, Iain M., Jarvis, Martin J., Bryant, Andrew E., Anderson, H. Ross and Bland, J. Martin (1998) Maternal cotinine level during pregnancy and birthweight for gestational age International Journal of Epidemiology, 27, (4), pp. 647-656.

More information

Submitted date: 15 December 1997
Published date: 1998

Identifiers

Local EPrints ID: 72833
URI: http://eprints.soton.ac.uk/id/eprint/72833
ISSN: 0300-5771
PURE UUID: d55d6abd-82a3-4592-8a7c-791bff853b4e

Catalogue record

Date deposited: 04 Mar 2010
Last modified: 18 Jul 2017 23:52

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Contributors

Author: Janet L. Peacock
Author: Derek G. Cook
Author: Iain M. Carey
Author: Martin J. Jarvis
Author: Andrew E. Bryant
Author: H. Ross Anderson
Author: J. Martin Bland

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