为了解民航系统不同职业人群脂肪肝患病状况 ,我们于 1999年对民航华北地区部分机关人员、飞行人员、空中交通管制员 (以下简称管制员 )分年龄组进行了调查 ,现将结果报告如下。一、对象和方法1.对象 :民航华北地区 1999年度体检的飞行人员 2 415例、管制员 379例、机关人员 38 In order to understand the prevalence of fatty liver disease among different occupational groups in the civil aviation system, we conducted a survey of some agencies, pilots, and air traffic controllers (hereinafter referred to as controllers) in civil aviation in northern China in 1999 and reported the results as follows . I. Objects and Methods 1. Subjects: 2 415 civil aviation pilots in North China in 1999, 379 controllers and 38