Objective: To explore the associations of moderate to vigorous intensity physical activity (MVPA) and sedentary behavior (SB) among primary and secondary school students and their parents, so as to provide a scientific basis for formulating targeted physical activity promotion strategies for children and adolescents. Methods: From 2021 to 2022, basic information and 24 h movement behaviors of 2 484 pairs of students and their parents were collected from five primary and secondary schools in Haizhu District, Guangzhou City, with a convenient sampling combining with cluster sampling method. Component regression models were constructed to analyze the relationship between parental MVPA, SB and primary and secondary school students MVPA and SB, and a component isochronous substitution model was used to explore the effects of mutual substitution between parental MVPA, residual components (time use components other than SB during the 24 h period), and SB on the behavioral activities of MVPA and SB in primary and secondary school students. Results: Parental MVPA and SB of students in grade 1 to 3 were positively correlated with both students MVPA and SB ( β=0.06, 0.12, P <0.01). The component isochronous substitution model showed that substituting 10 and 20 minutes of MVPA for SB by parents in grade 1 to 3 was associated with an increase in MVPA of students, and substituting 10 and 20 minutes of residual ingredients for SB was associated with a decrease in SB of students, with mean changes of 0.8 (95% CI =0.4-1.2) and 1.4 (95% CI =0.7-2.2) and -1.4 (95% CI =-1.7 to -1.1) and -2.9 (95% CI =-3.4 to -2.3)( P <0.05). No statistically significant associations were observed between parents of students in grades 4 to 6 and 7 to 9 and students physical activity and sedentary behaviour ( P >0.05). Conclusions Parents of students in grades 1 to 3 increases MVPA and decrease SB are beneficial to increase MVPA and decrease SB of students. Parents could promote physical activity among primary and secondary school students, and the intervention gateway should be advanced, with the low grades as the optimal intervention period.

ObjectiveTo establish a nomogram predictive model based on magnetic resonance cholangiopancreatography-related parameters and liver-to-muscle ratio， and to investigate the application value of this model in preoperative assessment of liver reserve function in patients with hepatic space-occupying lesion. MethodsClinical data and Gd-EOB-DTPA MRI imaging data were collected from 112 patients with hepatic space-occupying lesion who were hospitalized and scheduled for surgery in Wuming Hospital of Guangxi Medical University from April 2022 to April 2024. According to the degree of liver injury， the patients were divided into Child-Pugh class A group （65 patients with compensated liver function） and Child-Pugh class B+C group （47 patients with decompensated liver function， including 42 patients with Child-Pugh class B liver function and 5 patients with Child-Pugh class C liver function）. The two groups of patients were measured in terms of liver-to-muscle ratio， relative signal intensity of the common bile duct， and bile duct score in different phases of contrast-enhanced CT scan， and univariate and multivariate Logistic regression analyses were used to identify independent predictive factors and establish a nomogram model. In addition， the receiver operating characteristic （ROC） curve， the calibration curve， and the decision curve were plotted to assess the discriminatory ability， accuracy， and clinical application value of the model. The independent-samples t test was used for comparison of normally distributed continuous data between two groups， and the Mann-Whitney U test was used for comparison of data with skewed distribution between two groups； the chi-square test was used for comparison of categorical data between two groups. ResultsThere were significant differences between the two groups in liver-to-muscle ratio at 5 minutes （Z=-3.99， P0.001）， 10 minutes （Z=-4.39， P0.001）， 15 minutes （Z=-4.23， P0.001）， and 20 minutes （Z=-5.40， P0.001） during the hepatobiliary phase， the relative enhancement degree of the common bile duct （Z=-4.85， P0.001）， and bile duct score （t=7.99， P0.001）. The multivariate Logistic regression analysis showed that liver-to-muscle ratio at 10 minutes during the hepatobiliary phase （odds ratio ［OR］=0.63， 95% confidence interval ［CI］： 0.44 — 0.90， P0.05）， liver-to-muscle ratio at 20 minutes during the hepatobiliary phase （OR=0.38， 95%CI： 0.17 — 0.82， P0.05）， and bile duct score （OR=0.17， 95%CI： 0.07 — 0.39， P0.05） were independent influencing factors for the preoperative diagnosis of liver function decompensation. The nomogram model established based on liver-to-muscle ratio at 10 minutes during the hepatobiliary phase， liver-to-muscle ratio at 20 minutes during the hepatobiliary phase， and bile duct score had an area under the ROC curve of 0.905 （95%CI： 0.849 — 0.960）， with a sensitivity of 78.7% with a specificity of 89.2%. ConclusionThe nomogram model established based on the liver-to-muscle ratio at 10 and 20 minutes during the hepatobiliary phase and bile duct score can effectively assess the status of liver reserve function in patients with hepatic space-occupying lesion before surgery.

Objective:To explore the genetic basis for a child with developmental delay and intellectual deficit (DD/ID).Methods:A child who was admitted to the Maternal and Child Health Care Hospital of Longhua District of Shenzhen City on June 3, 2023 due to DD/ID, craniofacial malformations, and recurrent infections of upper respiratory tract was selected as the study subject. G-banded chromosomal karyotyping was carried out for the child and her parents. Low-depth genome-wide copy number variation sequencing (CNV-seq) and chromosomal microarray analysis (CMA) were used to screen for genome-wide copy number variation (CNV), and fluorescence in situ hybridization (FISH) was used to verify the origin of candidate CNV. This study was approved by the Maternal and Child Health Care Hospital of Longhua District of Shenzhen City(Ethics No. 2023052504). Results:The child, an 8-year-old girl, had featured unexplained growth and intellectual development delay, multiple craniofacial malformations, and recurrent infections of the upper respiratory tract. She was found to have a karyotype of 46, XX, der(6)add(6)(q23), while both of her parents were normal. Both CNV-seq and CMA showed that the child has harbored a 21.38 Mb interstitial duplication at 6p25.3p22.3 and a 0.78 Mb terminal deletion at 6p25. FISH verified that both the duplication and deletion had occurred de novo. Conclusion:The abnormal phenotype of the child may be attributed to the 6p duplication and terminal deletion.

As a non-invasive， simple， and reproducible examination， Gd-EOB-DTPA-enhanced magnetic resonance imaging （MRI） has an important application value in evaluating liver reserve function. Currently in clinical practice， Gd-EOB-DTPA-enhanced MRI is mainly used to measure liver parenchymal signal intensity parameters， magnetic resonance relaxation time parameters， biliary tract enhancement parameters， and liver volume parameters to evaluate the liver reserve function of patients. In recent years， the use of Gd-EOB-DTPA-enhanced MRI in predicting liver reserve function in residual liver tissue after liver tumor surgery has become one of the hotspots in clinical research， and certain progress has been made in related studies in China and globally. This article reviews the research advances in recent years.

The visual impairment and blindness caused by myopia have become a global burden, and the World Health Organization has included the prevention and control of myopia in the global program for preventing blindness. In China, the development of myopia is showing a trend with higher incidence, younger age, and higher refractive errors. Moving forward the port of prevention and control myopia has become an important strategy to address the current predicament. Premyopia refers to the stage in children where the refractive power is ≤+0.75 D and >-0.50 D, and there are multiple risk factors during this stage that can potentially lead to myopia. Currently, the incidence of premyopia and its transformation into myopia is high, and the key prevention and control measures include building a predictive model for the transformation of premyopia into myopia, emphasizing the reduction of exposure to risk factors, using low-concentration atropine eye drops, red light therapy, and optical defocus intervention. This article provides a comprehensive review of the current situation regarding the incidence of premyopia and its transformation into myopia, as well as the research progress on existing prevention and control measures, with the aim of providing relevant references for the prevention and control of myopia during the premyopia stage.

Purpose To investigate the clinicopathological features,diagnosis and differential diagnosis of the primordial odontogenic tumour(POT).Methods Clinical data of 4 cases of jawbone POT were collected.Imaging examination,HE,and immunohistochemical EnVision two-step staining was used to an-alyze their clinical and pathological characteristics,and relevant literatures were reviewed.Results The age arranged from 5 years to 21 years.2 cases were male and 2 case were female.There were 2 cases in maxilla and 2 cases in mandible.The clinical presentation was a slow growing painless mass.Cut sur-face of the tumor was appeared grayish yellow and grayish white,the tumor involved the crown of an unerupted tooth.The tumour consisted of a proliferation of spindled and stellate cells in myx-oid stroma.Surfaced by cuboidal to columnar epithelium forming papillary structures and invaginations.Calcification was observed in 2 cases.Conclusion POT is a rare benign mixed odontogen-ic tumor that is more common in children and adolescents.Mas-tering its characteristic histological morphology can make a cor-rect diagnosis.Local complete resection of the tumor has a good prognosis.

Objective To assess the application value of sequential non-invasive prenatal testing(NIPT)for pregnant women with abnormal single values of early Down's screening.Methods A total of 1 631 pregnant women with abnormal single values of traditional early Down's screening were selected from Shenzhen Long-hua Maternal and Child Health Hospital from January to October in 2022,and all of them voluntarily under-went NIPT with signed informed consent.The high-risk samples screned by NIPT wre conducted invasive prenatal diagnosis and tracked pregnancy outcomes,and yet low-risk pregnant women was followed up after the due date.Results Among all the pregnant women,a total of 10 high-risk samples of fetal chromosomal aneuploidy were detected by sequential NIPT,including 1 case of trisomy 21,1 case of trisomy 18,7 cases of sex chromosome abnormalities,and 1 case of other autosomal abnormalities.9 cases of high-risk pregnant women received invasive prenatal diagnosis,and 5 cases were consistent with NIPT results,which had yielded a positive predictive value of 55.56％.Among them,the positive predictive values of trisomy 21,trisomy 18,sex chromosome abnormalities and other autosomal abnormalities were 100.00％,100.00％,50.00％,0.00％,resepectively.Conclusion Sequential NIPT could improve the detection of defective children in pregnant women with abnormal single values of early Down's screening,which has certain guiding value for expanding screening to reduce the birth of defective children.In view of its low positive predictive value,pregnant women with abnormal single value of Down's screening should be paid more attention,and further prenatal diagnosis may be necessary to reduce the birth rate of defective children.

Objective Analyze the implementation effects of the specialized disease management policy(hereinafter re-ferred to as the policy)to provide reference for strengthening operational management and enhancing the integration of business and finance in public hospitals.Methods Patient information of inpatients from a large comprehensive tertiary hospital from Jan-uary 2022 to June 2023 was collected.Four out of ten single diseases focused on by the national tertiary public hospital perform-ance assessment were included in the study group for specialized disease management,while the remaining six were used as the control group.A difference-in-differences model was adopted to analyze the changes in relevant indicators such as per capita inpa-tient expenses,average length of stay,per capita drug expenses,per capita consumable expenses,and per capita examination and treatment expenses before and after the policy implementation.Additionally,the effects of policy implementation were further analyzed based on different medical insurance types.Results A total of 22 457 patients were included,with 5 879 patients in the study group(3 164 cases before policy implementation and 2 715 cases after policy implementation),and 19 741 patients in the control group.The difference-in-differences model analysis showed that after the policy implementation,per capita inpatient expenses for specialized disease management patients decreased by 32.7％,average length of stay decreased by 31.4％,drug ex-penses decreased by 49.5％,consumable expenses decreased by 24.2％,and examination and treatment expenses decreased by 29.2％.Moreover,compared to patients under non-Wuhan medical insurance,patients under Wuhan medical insurance experi-enced a greater reduction in related indicators.Conclusion The implementation of the policy effectively reduces the burden on patients seeking medical care,improves medical treatment efficiency,contributes to hospital refined management methods,deep-ens the integration of business and finance,and facilitates the transition towards leaner operations.

Objective: To explore the association between light intensity physical activity (LPA) and sedentary behavior (SB) with body composition, so as to provide data references for improving adolescent physical health. Methods: From August 2020 to January 2021, general information of 694 students in grade one of a high school in Foshan City was collected, and the 24 hour activity behavior and body composition of the students were measured objectively by triaxial accelerometer and bioelectrical impedance tester. Dual component multivariate regression and dual compositional isotemporal substitution model were used to explore the relationship between LPA and SB and body composition. Results: LPA was associated with lower fat relative dominance (FRD) (male weekends FRD=-21.44%, female weekly FRD=-17.83%, weekdays FRD=-18.27%, P <0.05), and LPA was also associated with higher muscle relative dominance (MRD) and bone relative dominance (BRD) (male weekends MRD=12.78%, BRD= 12.87 %; female weekly MRD=11.64%, BRD=9.01%; female weekdays MRD=12.02%, BRD=9.23%, P <0.05). Replacing sedentary behavior (SB) with 10 minutes of LPA could reduce fat proportion [male:weekly -0.15(-0.26--0.04), weekdays -0.12 (-0.22--0.02); female:weekly -0.18(-0.27--0.08), weekdays -0.16(-0.25--0.07)) and increase muscle proportion (male:weekly 0.14(0.03-0.24), weekdays 0.11(0.02-0.21); female:weekly 0.17(0.07-0.26), weekdays 0.15(0.07-0.24)]. Conclusion Interrupting continuous SB with LPA can serve as an intervention measure to promote physical health and fitness in adolescents. School should encourage students to engage in frequent LPA during breaks and after school activities, while avoiding prolonged SB.

ABSTRACT OBJECTIVE To investigate the use of spironolactone tablet in children's hospital, and to explore the feasible scheme that can improve the current dosage distribution of spironolactone tablets, so as to meet the needs of precise and individualized clinical administration of pediatric patients. METHODS All the prescriptions including spironolactone tablet (20 mg per tablet) were obtained from 1st January 2021 to 31th December 2022 in Children's Hospital, Zhejiang University School of Medicine. The children's age, splitting specification, department distribution and problems of common tablet splitting were analyzed, appropriate countermeasures were explored according to literature and team practice. RESULTS A total of 11 239 spironolactone tablet prescriptions were included, among which, the proportion of splitting was 83.91%; in the splitting prescriptions, it showed the characteristics of young age, multi-dose specifications, strong drug specialization and long drug duration. Formulating the practice specification for manipulation of drugs, with the right dosing tool, contribute to improve the accuracy of manipulation of drugs and reduce adverse events caused by incorrect dosing; while, the exploration of extemporaneous liquid preparations and preparations in medical institutions, contributed to improve the accuracy and stability of dosing, and realize individualized drug delivery. CONCLUSION In this study, exploring the appropriate dosage regimen for spironolactone tablet as an example, feasible countermeasures with accurate fractional dose, controllable quality and high compliance of children are explored in combination with team practice and literature retrieval analysis, which is based on the actual clinical needs, so as to provide reference for finding appropriate fractional dose administration schemes for pediatric tablets.