Objective: To analyze the effects of maternal gestational weight gain and pre pregnancy body mass index (BMI) on the weight of preschool children,so as to provide scientific basis for prevention and treatment of overweight and obesity in children. Methods: Based on Jiangmen maternal and child health information platform, annual physical examination data of 3-6 years old preschool children from all nurseries and kindergartens in Jiangmen were collected from January to December 2024. A unique identification was made according to the mother s ID number and delivery date, and retrospective data collection was conducted on the platform to obtain pre pregnancy and pregnancy related information for 46 481 mothers. The Chi-square test,two way ordered variable analysis and Logistic regression analysis were used to compare the effects of maternal pre pregnancy BMI and gestational weight gain on overweight and obesity among preschool children. Results: A total of 5 168 (11.12%) children were overweight and obese, and the proportion of overweight and obesity in the 6 year old group was the highest (12.86%). There were significant differences in the detection rates of overweight and obesity between boys and girls ( χ 2=155.38), and there were also significant gender differences in the age groups of 4, 5 and 6 years ( χ 2=17.08, 96.97, 66.27)(all P <0.01). Through trend χ 2 test, the overall detection rates of overweight and obesity, as well as those for boys, increased with age ( χ 2 trend =49.36,60.54, both P <0.01). The BMI group of preschool children was correlated with the BMI group of their mothers before pregnancy and the weight gain group during pregnancy （χ 2= 1 250.64, 157.01, both P <0.01) and the proportion of children with higher BMI levels showed an upward trend with the improvement of their mothers pre-pregnancy BMI levels or gestational weight gain levels ( Gamma =0.13, 0.10, both P <0.01). Multiple Logistic regression analysis showed that pre pregnancy BMI groups as overweight ( OR =1.590, 1.922), obesity ( OR =2.100, 2.921 ), and male gender of the children ( OR =1.213, 1.763)，and newborns excessive birth weight( OR =1.001，1.001) increased the risks of overweight and obesity in preschool children; maternal gestational weight gain insufficiency ( OR =1.374) and advanced maternal age at the first prenatal visit ( OR =1.012) increased the risks of obesity in preschool children; maternal gestational weight gain deficiency or excess ( OR =1.324,1.118) increased the risk of overweight in preschool children (all P <0.01). Conclusions Maternal pre-pregnancy overweight and obesity and insufficient or excessive gestational weight gain increase the risk of overweight and obesity in preschool children. It is necessary to strengthen weight management before and during pregnancy to reduce the occurrence of childhood overweight and obesity.

Objective Maternal-and-child health(MCH)hospitals simultaneously provide clinical care and manage community-based public-health projects for women and children.We aimed to design and test a performance-based salary and e-valuation system that recognizes this dual responsibility and incentivizes high-quality public-health work.Methods Aligned with the national tertiary-level MCH-hospital performance appraisal standards and local project realities,we applied four industrial-en-gineering techniques—empirical time-and-motion estimation,classification,analogy and work-study—to convert every public-health project into quantifiable modules with pre-set labor-hour quotas.Bonuses were calculated under"more work,more pay"and"increment incentive"rules,while appraisal covered two dimensions:(ⅰ)project-specific indicators(coverage,timeliness,completeness)and(ⅱ)outcome evaluation(health impact and user satisfaction).Performance pay was then approved and dis-tributed to staff responsible for project management.Results Analysis of the 2022-2024 implementation period showed clear gains:① Work-force mobilization:departments managing MCH projects grew from 17 to 22 and staff from 22 to 73;all core pro-ject indicators improved significantly.② Service expansion:valid service volume generated by jurisdiction-level MCH project ac-tivities rose by 62.31％.Conclusion The scientific,standardized and operable performance and evaluation system for maternity and child projects developed in this study can help effectively improve the management efficiency of maternity and child projects in the jurisdiction and promote the high-quality development of the hospital.

Objective Maternal-and-child health(MCH)hospitals simultaneously provide clinical care and manage community-based public-health projects for women and children.We aimed to design and test a performance-based salary and e-valuation system that recognizes this dual responsibility and incentivizes high-quality public-health work.Methods Aligned with the national tertiary-level MCH-hospital performance appraisal standards and local project realities,we applied four industrial-en-gineering techniques—empirical time-and-motion estimation,classification,analogy and work-study—to convert every public-health project into quantifiable modules with pre-set labor-hour quotas.Bonuses were calculated under"more work,more pay"and"increment incentive"rules,while appraisal covered two dimensions:(ⅰ)project-specific indicators(coverage,timeliness,completeness)and(ⅱ)outcome evaluation(health impact and user satisfaction).Performance pay was then approved and dis-tributed to staff responsible for project management.Results Analysis of the 2022-2024 implementation period showed clear gains:① Work-force mobilization:departments managing MCH projects grew from 17 to 22 and staff from 22 to 73;all core pro-ject indicators improved significantly.② Service expansion:valid service volume generated by jurisdiction-level MCH project ac-tivities rose by 62.31％.Conclusion The scientific,standardized and operable performance and evaluation system for maternity and child projects developed in this study can help effectively improve the management efficiency of maternity and child projects in the jurisdiction and promote the high-quality development of the hospital.

Objective : To investigate the injury characteristics among primary and middle school students in Panyu District, Guangzhou City, so as to provide the evidence for developing the strategies for prevention and control of injuries. Methods: The data of 6 to 18 years old primary and middle school students with initial diagnosis of injury at Panyu District Central Hospital from 2014 to 2019 were collected. The basic characteristics of injury cases, the causes, time and place of injury development were analyzed by a descriptive epidemiological method. Results: Totally 10 833 primary and middle school students with injury were reported in Panyu District from 2014 to 2019, including 7 401 boys and 3 432 girls, with a boy/girl ratio of 2.16∶1. The injury predominantly occurred in primary school students (6 903 cases, 63.72%). The causes of injury mainly included fall (4 457 cases, 41.14%), animal injury (2 593 cases, 23.94%), blunt injury (1 682 cases, 15.53%), knife/sharp instrument injury (923 cases, 8.52%) and traffic injury (731 cases, 6.75%). The place of injury development mainly included home (4 267 cases, 39.39%), school and public place (3 184 cases, 29.39%), and road/street (1 854 cases, 17.11%). The injury predominantly occurred from August to October (3 289 cases, 30.36%), and the activities at the time of injury mainly included leisure activities (3 860 cases, 35.63%), life activities (2 662 cases, 24.57%) and sports (1 929 cases, 17.81%). The characteristics of injury mainly included contusion/abrasion (4 528 cases, 41.80%), sharp instrument/bite/open injury (4 019 cases, 37.10%) and fracture (871 cases, 8.04%), and the upper limb was the main injury site (3 552 cases, 32.79%). There were 9 877 cases with mild injuries (91.18%), and 10 451 cases left hospitals after seeing a doctor (96.47%). Conclusions Fall is the main causes of injury among primary and middle school students in Panyu District, and boys and primary school students are high-risk groups for injury. Family prevention should be emphasized, and health education pertaining to injury should be intensified among students during the long holidays and leisure activities.