The prevalence and the days of absence from duty of 100 human years of the workers with heavy workload are significantly higher than the control group. Their cure cost is more 8.03 times than the controls.

• 重体力劳动者的患病率和100人年的缺勤天数显著高于对照组 ；重体力劳动组的医疗费用是对照组的9.；03倍。