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- Title
Associations between weight change over 8 years and baseline body mass index in a cohort of continuing and quitting smokers.
- Authors
Lycett, Deborah; Munafò, Marcus; Johnstone, Elaine; Murphy, Michael; Aveyard, Paul
- Abstract
To examine the association between weight change and baseline body mass index (BMI) over 8 years in a cohort of continuing and quitting smokers. Prospective cohort. Oxfordshire general practices nicotine patch/placebo trial with 8-year follow-up. Eighty-five participants were biochemically proven abstinent at 3, 6, 12 months and 8 years (abstainers). A total of 613 smoked throughout the 8 years (smokers), 26 quit for a whole year but were smoking again by 8 years (relapsed); 116 smoked for the first year but were abstinent at 8 years (late abstainers). Weight and BMI was measured at baseline and at 8 years. Regression models were used to examine weight gain by smoking status and the association of BMI at the time of quitting. Abstainers gained 8.79 kg [standard deviation (SD) 6.36; 95% confidence interval (CI) 7.42, 10.17]. Smokers gained 2.24 kg (SD 6.65; 95% CI 1.7, 2.77). Relapsed smokers gained 3.28 kg (SD 7.16; 95% CI 0.328, 6.24). Late abstainers gained 8.33 kg (SD 8.04; 95% CI 6.85, 9.81). The association between baseline BMI and weight change was modified by smoking status. In smokers there was a negative linear association of BMI, while in abstainers a J-shaped curve fitted best. These models estimated weight change over 8 years in abstainers of +9.8 kg, +7.8 kg, +10.2 kg, +19.4 kg and in smokers of +3.9 kg, +2.6 kg, 1.0 kg and −0.8 kg, where BMI was 18, 23, 29 and 36, respectively. Obese smokers gain most weight on quitting smoking, while obese continuing smokers are likely to remain stable or lose weight. Obese quitters have the greatest need for interventions to ameliorate weight gain.
- Subjects
OXFORDSHIRE (England); ENGLAND; BODY mass index; WEIGHT gain; NICOTINE addiction; OVERWEIGHT persons; CIGARETTE smokers; SMOKING cessation; PLACEBOS; COHORT analysis; CONFIDENCE intervals; PSYCHOLOGY
- Publication
Addiction, 2011, Vol 106, Issue 1, p188
- ISSN
0965-2140
- Publication type
Article
- DOI
10.1111/j.1360-0443.2010.03136.x