Abstract: Objective To investigate the prevalence of sleep bruxism in Chinese school-age children,and to explore the influence of sleep bruxism on the height increase in childhood.Methods Totally 21408 school-age children aged 5 to 12 years from 8 different cities in China were enrolled in this study from November to December in 2005. Children′s basic information,sleep-related condition and health condition were collected by questionnaire survey. Heights and weights were measured by the trained health-care teachers in each school. The influence of sleep bruxism on height increase was analyzed by using multivariable liner regression. Results The overall prevalence of sleep bruxism was 23.7%(5 084/21 408) in school-age children in China. Factors that could influence height include gender(β=-0.007),age(t=7.73),light in the sleep room(F=30.10),time spend on sports(F=14.58),time spent on watching TV(F=22.76) and co-sleeping with parents(t=6.62) in the univariable analysis. Multivariable liner regression indicated that having sleep bruxism would attenuate the children′s height(β=-0.127). While the sensitivity analysis showed that the influence of sleep bruxism on height increase became larger with the increase of children′s age(5-6 years old:β=-0.131,7-8 years old:β=-0.098;9-10 years old:β=-0.115;11-12 years old:β=-0.196). Conclusion In Chinese school-age children,having sleep bruxism could negatively influence the height,especially in elder children,which might provide new evidence for clinical intervention.

Key words: sleep bruxism, height, school-age children

摘要： 目的 研究我国学龄期儿童夜磨牙症的发病率,并探索儿童夜磨牙症对身高的影响。方法 本研究于2005年11-12月选取了来自我国8座城市的共计21 408名5~12周岁学龄期儿童为研究总体。通过问卷调查的方式收集了每位儿童的基本信息,睡眠情况,健康情况等。身高以及体重的测量均由经过专业培训的各学校保健老师完成。夜磨牙症与身高的关系采用多元线性回归的方法进行分析。结果 在我国学龄期儿童中,夜磨牙症的发生率大约为23.7%(5 084/21 408),单因素分析,研究发现对儿童身高有影响的因素包括年龄(β=-0.007),性别(t=7.73),睡眠光线(F=30.10),运动情况(F=14.58),看电视时间(F=22.76)以及与父母同床(t=6.62)。将上述有影响的因素均带入到最终的多元线性回归模型中发现,儿童夜磨牙症对身高仍存在影响(β=-0.127)。此外,通过分年龄的敏感性分析发现,5~6岁年龄组(β=-0.131),7~8岁年龄组(β=-0.098),9~10岁年龄组(β=-0.115),11~12岁年龄组(β=-0.196),随着儿童年龄的不断增长,夜磨牙症对身高的影响也会越来越大。结论 在我国学龄期儿童中,夜磨牙症的存在会影响儿童身高的增长,并且年龄越大,影响越严重,这一发现或许能够提供新的临床思路以及干预手段。

关键词: 夜磨牙症, 身高, 学龄期儿童