中文摘要：

目的 系统分析中国青少年首次遗精年龄的基本状态、变化和特点。方法 应用荟萃分析（meta 分析）方法，计算机和人工文献检索文献，根据纳入标准进行数据筛选、整理加工和质量评价，获得1980—2013年公开发表的学术文献报告74篇共192个数据，涉及近43.5万人。结果 1980—2013年来，我国青少年首次遗精年龄明显提前（y=-0.0424x＋99.129，R2=0.3268，P〈0.01），首次遗精年龄平均为14.40岁，由1980年的15.18岁提前至2013年的13.78岁，34年间变化1.40岁；南方和北方地区均与年代呈明显负相关（P〈0.000 1），34年间分别提前1.16岁和1.33岁；北方地区的首次遗精年龄明显晚于南方地区（P〈0.001），但随年代提前的速度比南方快；相同地区的城镇地区明显早于农村地区（P〈0.001），但农村地区提前（1.39岁）幅度高于城镇（0.91岁），城乡之间差异在减小；年代（1980—1995、1996—2005和2006—2013的3个年代段）和地区（南方与北方）、城镇与农村的各个因素间均具有明显的交互作用（P〈0.001）。结论 1980—2013年我国青少年首次遗精年龄明显提前，年代、地区、城乡差异以及之间的交互作用均会对首次遗精年龄产生影响。

英文摘要：

Objective To analyze the change in the age at first spermatorrhea among adolescents in China.Methods Totally 74 relevant literatures published between 1980 and 2013 were retrieved via computer and manual searches;the literatures presented 192 sets of data collected among 434 992 people aged 6-21 years in all provinces,municipalities and autonomous regions of China,except for Tibet Autonomous Region,Hong Kong Special Administrative Region,and Macao Special Administrative.Meta-analysis was adopted in the study.Results During the 34 years,the age at the first spermatorrhea in Chinese adolescents declined significantly by 1.40 years from 15.09 years in 1980＇s to 13.78 years in 2013 （y=-0.042 4x＋99.129,R2=0.3268,P〈0.01）,with an average age of 14.40 years.The average age at first spermatorrhea was reversely correlated with the years among the adolescents in both the north and south areas of China （both P〈0.0001）,with the decreased average years of 1.16 years and 1.33 years for the adolescents in the south and north areas of China.The adolescents in the north areas had a significantly elder age at first spermatorrhea （P〈0.001） but a greater decline in the average age than those in the south areas.For the adolescents in a same area,those in the cities showed a younger age at first spermatorrhea than the adolescents in countryside;while the rural adolescents presented a greater decline in the age of first spermatorrhea than the urban adolescents （1.39 years vs.0.91 year）.There were significant interactions in the impacts of different periods of time （every 10 years） and residential area （urban vs.rural and the south vs.north） on the age at first spermatorrhea among the adolescents （P〈0.001）.Conclusion Between 1980 and 2013,The age at first of spermatorrhea declined significantly and influenced interactively by period of time and residential area,urban and rural difference among Chinese adolescents between 1980 and 2003.