Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada.
Department of Human Nutrition, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.
BMJ Open. 2019 Jul 16;9(7):e024552. doi: 10.1136/bmjopen-2018-024552.
This study aimed to determine how inmates' body weight changed during incarceration in Canadian federal penitentiaries, based on their history of tobacco use. Since tobacco was banned from all Canadian federal penitentiaries in 2008, little is known about the unintended health consequences of this ban, especially on inmates' body weight.
Cohort study.
Participants were male and female inmates incarcerated for at least 6 months in Canadian federal penitentiaries. We collected data from 10 institutions in two Canadian regions (Ontario and Atlantic).
We collected data from 754 inmates who volunteered to participate in the study.
This study examined weight change in relation to a history of tobacco use. In 2016-2017, anthropometric data were collected and compared with recorded anthropometric data at the beginning of incarceration (mean follow-up of 5.0±8.3 years). Self-reported data on tobacco and substance use were collected. Weight change was compared between inmates with and without a history of tobacco use.
The main outcome measures were body weight change (kg), body mass index (BMI) change (kg/m), annual weight change (kg/year), and BMI and waist circumference (cm) at the time of the interview.
During incarceration, ex-smokers gained more than twice the amount of weight compared with non-smokers (7.5 kg weight gain for smokers vs 3.7 kg weight gain for non-smokers). Once adjusted for covariates in a regression analysis, for inmates who gained the most weight (75th and 90th percentiles), non-smokers had, respectively, 1.64 and 2.3 lower BMI points than ex-smokers.
During incarceration in Canadian federal penitentiaries, inmates with a history of tobacco use gained significantly more weight than non-smokers. This put them at increased risk of developing obesity-related health problems. This information is important for the prison setting when planning related programmes and regulation.
本研究旨在根据囚犯的吸烟史，确定他们在加拿大联邦监狱服刑期间体重的变化情况。由于 2008 年加拿大所有联邦监狱都禁止吸烟，因此人们对这一禁令所带来的意想不到的健康后果知之甚少，尤其是对囚犯的体重。
队列研究。
参与者为至少在加拿大联邦监狱服刑 6 个月的男性和女性囚犯。我们从加拿大两个地区（安大略省和大西洋地区）的 10 个机构收集数据。
我们收集了 754 名自愿参加研究的囚犯的数据。
本研究考察了吸烟史与体重变化的关系。在 2016-2017 年，收集了人体测量数据，并与入狱初期记录的人体测量数据进行了比较（平均随访时间为 5.0±8.3 年）。收集了关于吸烟和物质使用的自我报告数据。比较了有和没有吸烟史的囚犯之间的体重变化。
主要结果测量指标为体重变化（kg）、体重指数（BMI）变化（kg/m）、体重年变化（kg/year）以及访谈时的 BMI 和腰围（cm）。
在监禁期间，与不吸烟者相比，戒烟者的体重增加了两倍多（吸烟者体重增加 7.5kg，不吸烟者体重增加 3.7kg）。在回归分析中调整了协变量后，对于体重增加最多的囚犯（第 75 个和第 90 个百分位数），不吸烟者的 BMI 分别比戒烟者低 1.64 和 2.3 个点。
在加拿大联邦监狱服刑期间，有吸烟史的囚犯体重增加明显多于不吸烟者。这使他们面临肥胖相关健康问题的风险增加。这些信息对于监狱规划相关计划和法规制定非常重要。
