Objective: To investigate the relationship between working duration and work-related musculoskeletal disorders (WMSDs) among Internet enterprise employees. Methods: Employees were randomly sampled from five Internet enterprises in Jiaxing City of Zhejiang Province using the cluster sampling method. Participants' demographics and working duration were collected using questionnaire surveys, and the fatigue accumulation and WMSDs were assessed using the Self-diagnosis Questionnaire for Fatigue Accumulation and the Musculoskeletal Disorders Questionnaire. The working duration per week was classified into 40 h and less, 40 to 48 h, 48 to 56 h and 56 h and longer, and more than 40 h working duration per week was defined as long working duration. The association between working duration and WMSDs was examined with a multivariable logistic regression model. Results: Among 334 questionnaires recovered, 280 were valid, with an effective recovery rate of 83.83%. The participants included 211 men (75.36%) and 69 women (24.64%), and there were 204 participants at ages of less than 36 years (72.86%) and 234 participants with long working duration (83.57%). The detection of fatigue accumulation and WMSDs was 33.21% and 65.36% among the participants, with the highest prevalence of WMSDs detected in the neck (52.50%). Multivariable logistic regression analysis showed that weekly working duration correlated with WMSDs (>40 to 48 h, OR=2.199, 95%CI: 1.083-4.468; >56 h, OR=6.688, 95%CI: 1.902-23.520) after adjustment for gender, marital status and sleep disorders. If fatigue accumulation was included in the model, there was no statistical correlation between weekly working duration and WMSDs (P>0.05). Conclusion Long working duration may increase the risk of WMSDs among Internet enterprise employees, and fatigue accumulation may play a mediating role.

Objective To learn the change of causes sequences, the pattern and dynamic trend of causes of death for the inhabitants in Jiaxing from 2009 to 2014, and to provide a major reference for health decisions and disease control and prevention. Method This study was based on chronic disease surveillance information management data in Zhejiang province from 2009 to 2014. ICD-10 criteria and method was used to classify the causes of death. To evaluate health status of those residents, the relative health indicators such as mortality rate, constituent ratio, PYLL, AYLL, PYLL‰were used. Results The average mortality rate of residents was 691.92/100 000 of Jiaxing from 2009 to 2014, with male 760.73/100 000 and female 624.64/100 000 (the average mortality rate of male was significantly higher than that of female, χ2=455.52, P<0.01). The top five causes of death of local residents were malignant neoplasm, respiratory system diseases, cerebrovascular diseases, injury and poisoning, heart diseases, which accounted for 87.95%of all deaths. The mortality caused by malignant neoplasm was 189.53/100 000, which accounted for 31.90% of five main death causes (the rate of male was significantly higher than that of female, χ2=3767.70, P<0.01). The PYLL of malignant neoplasm were 38 368 years, which was the main reason. The AYLL of injury and poisoning were 9.58 years. Conclusion The average mortality rate of residents has been declining across the Jiaxing, but the mortality rate of malignant neoplasm is increasing year by year. The data suggested that malignant neoplasm, cardiovascular disease, unintentional falls, motor vehicle traffic accidents and pneumonia are major factors affecting the health of the population.

Objective : To investigate the current status of hearing loss in a fastener manufacturing enterprise, and to analyze its influencing factors, so as to provide insights into occupational disease prevention and control. Methods: The occupational health examination data of noise exposed workers and the workplace occupational disease hazard factors detection data in a fastener manufacturing enterprise in Jiaxing City in 2022 were collected through the Occupational Disease and Occupational Health Hazard Factors Detection System of China Disease Prevention and Control Information System, and factors affecting the development of high-frequency noise-induced hearing loss (HFNIHL) and speech-frequency noise-induced hearing loss (SFNIHL) were analyzed. Results: Totally 625 workers were investigated, with a median age of 44.00 (interquartile range, 13.00) years and a median length of service of 8.00 (interquartile range, 9.00) years, and including 519 men (83.04%) and 106 women (16.96%). There were 309 workers with single noise exposure (49.44%) and 316 workers with joint noise exposure (50.56%), and 518 workers exposed to noise with the normalized continuous A-weighted sound pressure level equivalent to a 40 h working week (LEX,40 h) that exceeded the national standard (82.88%). The detection rates of HFNIHL and SFNIHL were 49.12% and 35.04%, respectively. Multivariable logistic regression analysis indicated that males (OR=10.528, 95%CI: 5.271-21.025), length of service of 10 years and longer (OR=2.451, 95%CI: 1.599-3.759), LEX,40 h of >85 dB (A) (OR=2.227, 95%CI: 1.318-3.764) and joint noise exposure (OR=3.002, 95%CI: 2.080-4.334) were associated with an increased risk of HFNIHL, and male (OR=9.400, 95%CI: 4.211-20.985), LEX,40 h of >85 dB (A) (OR=2.305, 95%CI: 1.345-3.951), and joint noise exposure (OR=3.880, 95%CI: 2.677-5.623) were associated with an increased risk of SFNIHL. Conclusion Gender, length of service, noise intensity and exposure mode are factors affecting the risk of HFNIHL, while gender, noise intensity and exposure mode are factors affecting the risk of SFNIHL.

ObjectiveTo explore the effect of exposure to atmospheric particulate matters on the outpatient visits of respiratory disorders in Jiaxing City，Zhejiang Province. MethodsDaily air pollutant monitoring data，meteorological data and outpatient visits of respiratory disorders in Jiaxing City from 2019 to 2021 were collected．A generalized additive model was applied to evaluate the effect and laggeel effect of the concentrations of atmospheric particulates for outpatient visits of respiratory disorders after adjusting for secular trend， day-of-the-week effect， holiday effect， and meteorological variables. ResultsThe daily average concentrations of PM_2.5， PM₁₀， O₃ and NO₂ exceeded the standard， and the proportion of days exceeding the standard was 3.4%， 1.3%， 11.0% and 0.8%， respectively. Every 10 μg·m^-3 increase in PM_2.5 concentration showed the strongest effects on the daily outpatient visits of respiratory disorders， adult and childhood respiratory disorders all on lag07 with ER（95%CI） being 2.29%（1.35%‒3.24%）， 2.31% （1.39%‒3.23%） and 2.65 % （1.36%‒3.96%）， respectively. The maximum ER of outpatient visits for respiratory disorders in children was higher than that in adults. Every 10 μg·m^-3 increase in PM₁₀ concentration showed the strongest effects on the daily outpatient visits of respiratory disorders on lag07， adult respiratory disorders on lag06 and childhood respiratory disorders on lag07 with ER（95%CI） being 1.42% （0.87%‒1.96%）， 1.49%（0.99%‒1.99%） and 1.61% （0.87%‒2.36%）， respectively. The results of double-pollutant model showed that the effect of atmospheric particulate reduced after O₃ was introduced into the model. ConclusionThere are a short-term effect and a laggeel effect of atmospheric particulate on the outpatient visits of respiratory disorders. It is necessary to strengthen the health protection of the respiratory system of the population， especially the children.