Department of Epidemiology and Public Health, Cancer Research UK Health Behaviour Research Centre, University College London, London, UK.
Addiction. 2013 Sep;108(9):1680-5. doi: 10.1111/add.12241. Epub 2013 Jun 4.
To assess the incidence of long-term smoking cessation as a function of age, gender, social grade and their interactions.
Cross-sectional surveys of population representative samples of smokers in England.
A total of 24 094 ever smokers (≥21 and ≤60 years of age) participating in household surveys between November 2006 and February 2011.
The ratio of long-term (>1 year) ex-smokers to ever-smokers was calculated for each age. Regression analyses were used to model the association between age and quit ratio, with the change in quit ratio by year of age n years versus all years up to n-1 years, yielding an estimate of the quitting incidence at that age. Analyses were conducted for the entire sample and then for the sample stratified by gender and social grade, and interactions assessed between these variables.
A cubic trend was needed to fit the data. The estimated quitting incidence between ages 21 and 30 was 1.5% (95% CI: 1.0%-2.0%), between 31 and 50 it was 0.3% (95% CI: 0.2%-0.5%) and between 51 and 60 it was 1.2% (95% CI: 0.7%-1.7%). Age interacted with gender and social grade: women and smokers from higher social grades had a higher incidence of quitting than men and those from lower social grades specifically in young adulthood. CONCLUSIONS : The incidence of smoking cessation in England appears to be greater in young and old adults compared with those in middle age. Women and higher social grade smokers show a greater incidence of quitting than men and those from lower social grades specifically in young adulthood.
评估长期戒烟的发生率，分析年龄、性别、社会阶层的作用及其相互关系。
对英格兰吸烟者进行的横断面调查，抽样具有人群代表性。
共有 24094 名曾吸烟者（年龄≥21 岁且≤60 岁）参加了 2006 年 11 月至 2011 年 2 月期间的家庭调查。
计算了每个年龄组的长期（>1 年）戒烟者与曾吸烟者的比例。采用回归分析模型，分析年龄与戒烟比例的关系，即 n 岁时戒烟比例的变化与 n-1 岁前所有年份的变化，从而得出该年龄的戒烟发生率估计值。进行了全样本分析，然后对性别和社会阶层分层的样本进行了分析，并评估了这些变量之间的相互作用。
需要采用三次趋势来拟合数据。在 21-30 岁年龄组，估计的戒烟发生率为 1.5%（95%CI：1.0%-2.0%）；在 31-50 岁年龄组，为 0.3%（95%CI：0.2%-0.5%）；在 51-60 岁年龄组，为 1.2%（95%CI：0.7%-1.7%）。年龄与性别和社会阶层存在交互作用：与男性和社会阶层较低的吸烟者相比，女性和社会阶层较高的吸烟者，尤其是在年轻成年期，戒烟的发生率更高。
在英国，与中年人群相比，年轻人和老年人的戒烟率似乎更高。与男性和社会阶层较低的吸烟者相比，女性和社会阶层较高的吸烟者，尤其是在年轻成年期，戒烟的发生率更高。
