Trends of pulmonary function among youth aged 7-18 in Heilongjiang province from 1985 to 2014

Objective To analyze the trends of pulmonary function among youth aged 7-18 in Heilongjiang province from 1985 to 2014,and to provide evidence for health promotion.Methods Data were collected from National Surveys on Students Constitution and Health (1985 to 2014).Vital capacity and vital capacity-weight index was analyzed among urban boys and girls,as well as rural boys and girls.Results From 1985 to 2014,the vital capacity-weight index among urban boys decreased by 16.15 mL/kg and vital capacity decreased by 76.08 mL;the figures were 14.33 mL/kg and 204.83 mL among urban girls,15.48 mL/kg and 88.27 mL among rural boys,14.37 mL/kg and 240.19 mL among rural girls.In general,pulmonary function showed significant decreasing trend from 1985 to 2005 and slightly increasing trend from 2010 to 2014.Conclusion Over the past three decades,pulmonary function among 7-18 year-old students in Heilongjiang province shows decreasing trends,especially in urban area and boys.Comprehension and effective measures should be taken into action.