Objective To investigate the incidence of non-infectious diseases at different stages of a prolonged escort missiononboard the frigate.Methods The constituent ratio of non-infectious diseases occurred at different stages of a prolonged escort missionby a certain frigate was calculated,and the incidence of various non-infectious diseases at different stages was compared accordingly.Results For non-infectious diseases occurred during the whole course of the mission,the top 3 non-infectious diseases were lumbarmuscle strain,insomnia and motion sickness.Then came dermatitis,dental ulcer,xerophthalmia,trauma and cardiovascular diseases.The onset stages (early,middle and late stages)of various non-infectious diseases were different from one another.The incidence oflumbar muscle strain,insomnia,dermatitis,dental ulcer and xerophthalmia at late stage of the mission was significantly higher than thatat the early stage(P <0.01),and the incidence of motion sickness at the early stage was significantly higher than that at late stage(P <0.01).Conclusion With the extension of the escort mission,the incidence of lumbar muscle strain,insomnia,dermatitis,dentalulcer and xerophthalmia increased,while the incidence of motion sickness decreased.

0.05);the disappearance rate of varices of fundus of stomach and esophagus in the combined devascularization group was higher than that in control group(P0.05).The long-term(fourth to seventh year)survived rate of the combined devascularization group was higher than that of control group(98.3% in the combined devascularization group,90.0% in control group)(P