In Belgium, smoke-free legislation was implemented in different phases. The first phase, implemented on 1 January 2006, required all public places and workplaces to be smoke-free. The legislative ban on smoking in restaurants was introduced on 1 January 2007, while for bars serving food, smoke-free legislation was implemented on 1 January 2010. These successive steps in legislation gave us the opportunity to investigate possible stepwise changes in preterm delivery. To investigate the incidence of preterm delivery in the Belgian population after the three steps implementation of smoke-free legislation. Logistic regression analyses was used. We found reductions in the risk of preterm birth after the introduction of each phase of the smoking ban. No decreasing trend was evident in the years or months before the bans. We observed a step change in the risk of spontaneous preterm delivery of -3.13% (95% CI -4.37% to -1.87%; P＜0.01) on 1 January 2007 (ban on smoking in restaurants), and an annual slope change of -2.65% (-5.11% to -0.13%; P=0.04) after 1 January 2010 (ban on smoking in bars serving food). The analysis for all births gave similar results: a step change of -3.18% (-5.38% to -0.94%; P＜0.01) on 1 January 2007, and an annual slope change of -3.50% (-6.35% to -0.57%; P=0.02) after 1 January 2010. These changes could not be explained by personal factors (infant sex, maternal age, parity, socioeconomic status, national origin, level of urbanisation); time related factors (underlying trends, month of the year, day of the week); or population related factors (public holidays, influenza epidemics, and short term changes in apparent temperature and particulate air pollution). Our study shows a consistent pattern of reduction in the risk of preterm delivery with successive population interventions to restrict smoking. This finding is not definitive but it supports the notion that smoking bans have public health benefits from early life.
展开▼
机译：在比利时，不同阶段实施了无烟立法。第一阶段于2006年1月1日实施，要求所有公共场所和工作场所都必须禁烟。于2007年1月1日实施了餐馆禁烟立法，而对于提供食物的酒吧，自2010年1月1日实施了无烟立法。这些连续的立法步骤使我们有机会调查早产的可能逐步变化。在执行无烟立法的三步法之后，调查比利时人口中早产的发生率。使用逻辑回归分析。我们发现，在禁烟令的每个阶段实施之后，早产的风险都降低了。在禁令实施之前的数年或数月中，没有明显的下降趋势。我们观察到2007年1月1日自发早产风险的阶跃变化为-3.13％（95％CI -4.37％至-1.87％; P ＜0.01）（餐厅禁止吸烟），并且年度坡度变化为-2010年1月1日之后为-2.65％（-5.11％至-0.13％; P = 0.04）（禁止在提供食物的酒吧中吸烟）。对所有婴儿的分析均得出相似的结果：2007年1月1日的阶跃变化为-3.18％（-5.38％至-0.94％; P ＜0.01），年斜率变化为-3.50％（-6.35％至-0.57）。 ％; P = 0.02）在2010年1月1日之后。这些变化无法用个人因素（婴儿性别，产妇年龄，同等，社会经济地位，国籍，城市化水平）来解释;与时间相关的因素（潜在趋势，一年中的月份，一周中的一天）;或与人口有关的因素（公众假期，流行性感冒以及表观温度和微粒空气污染的短期变化）。我们的研究表明，通过连续的人群干预措施来限制吸烟，可以降低早产风险的一致模式。这一发现不是确定的，但它支持禁烟令从早年生活中对公共健康有好处的观点。
展开▼
