中国和国际的研究已经明确了可使儿童易患肺炎的多种因素,包括低出生体重、缺少母乳喂养、难产、营养不良、拥挤以及室内空气烟雾污染.中国的一些实验已经检验了上述因素同肺炎发病和死亡的相关性,其中以下相关因素有显著性: 一、与发病率升高相关的危险因素(括号内为相对危险度) Studies in China and internationally have identified a number of factors that can make children susceptible to pneumonia, including low birth weight, lack of breastfeeding, dystocia, malnutrition, congestion, and indoor air pollution. Some experiments in China have tested the above factors together The incidence of pneumonia and the incidence of death, of which the following related factors were significant: First, the risk factors associated with increased incidence (in parentheses relative risk)