Objective: To apply network analysis for exploring the relationship of maltreatment experiences and peer relationships with school bullying among middle school students, so as to provide empirical evidences for the development of targeted intervention programs. Methods: From March to April 2024, a total of 2 119 middle school students aged 12-18 in Shantou City were selected through stratified cluster random sampling. Self administered questionnaire was used to collect data on bullying experiences, maltreatment, and peer relationships. The Glasso network model was employed to estimate network structure. Results: The strongest edge in the network of maltreatment experiences, peer relationships and school bullying was the connecting line connecting peer acceptance and peer terrorized low self esteem (edge weight=0.59) among middle school students. The network faked fraudulent victimization was the most central node in the whole network (strength=7.98). The bridge symptoms of the network were sexual abuse, property bullying of others, relational bullying victimization, and verbal bullying of others, with the strongest bridge node being sexual abuse (bridge strength=1.07). In the accuracy estimation of centrality indices, closeness centrality demonstrated the highest accuracy, followed by strength and betweenness, with coefficient of stability of 0.60, 0.44 and 0.21, respectively. The stability of the network was good. Conclusion Peer acceptance has the strongest correlation with peer fear and inferiority, and is closely related to emotional abuse and emotional neglect.

Objective To investigate the changes in the structural parameters and mechanical properties of the necrotic femoral head and compare the effects of core decompression and hone grafting with those of bone cement filling on the mechanical properties and pre-vention of articular surface collapse of the necrotic femoral head.Methods Thirty-two fresh human femoral heads were collected from patients who underwent total hip arthroplasty at our hospital between June 2020 and January 2022.The femoral heads were divided into four groups:8 femoral neck fractures(TFF group),8 osteonecrosis of the femoral head(ONFH group),8 osteonecrosis of the femoral head treated with cement percutaneous injection(CPI group),and 8 osteonecrosis of the femoral head treated with core decompression and bone graft(CDBG group).Cement filling or core decompression was performed under radiographic guidance.All samples were scanned and three-dimensionally reconstructed using micro-CT.The spatial heterogeneity of the femoral head was observed,and the bone morphometric parameters of each region of interest were calculated.Mechanical analysis was performed to evaluate the femoral head parameters of dis-placement and stress in vitro.Results Bone microarchitecture and morphometry in necrotic femoral heads were markedly altered.The biomechanical properties of the necrotic zone in the femoral head were markedly weakened.After the necrotic area was filled with bone cement,the biomechanical properties of the necrotic zone of the femoral head increased significantly.In addition,after core decompres-sion and bone grafting in the necrotic area,the biomechanical properties increased significantly in the necrotic zone of the femoral head.Conclusion Bone cement filling or bone grafting in the necrotic area can change the biomechanical mechanism of the femoral head,improve the load-supporting ability,and prevent femoral head collapse.Cement filling may be a practical approach for the treatment of osteonecrosis of the femoral head that can be useful for practicing orthopedists.

Objective:To establish a set of artificial intelligence (AI) verification rules for blood routine analysis.Methods:Blood routine analysis data of 18 474 hospitalized patients from the First Hospital of Jilin University during August 1st to 31st, 2019, were collected as training group for establishment of the AI verification rules,and the corresponding patient age, microscopic examination results, and clinical diagnosis information were collected. 92 laboratory parameters, including blood analysis report parameters, research parameters and alarm information, were used as candidate conditions for AI audit rules; manual verification combining microscopy was considered as standard, marked whether it was passed or blocked. Using decision tree algorithm, AI audit rules are initially established through high-intensity, multi-round and five-fold cross-validation and AI verification rules were optimized by setting important mandatory cases. The performance of AI verification rules was evaluated by comparing the false negative rate, precision rate, recall rate, F1 score, and pass rate with that of the current autoverification rules using Chi-square test. Another cohort of blood routine analysis data of 12 475 hospitalized patients in the First Hospital of Jilin University during November 1sr to 31st, 2023, were collected as validation group for validation of AI verification rules, which underwent simulated verification via the preliminary AI rules, thus performance of AI rules were analyzed by the above indicators. Results:AI verification rules consist of 15 rules and 17 parameters and do distinguish numeric and morphological abnormalities. Compared with auto-verification rules, the true positive rate, the false positive rate, the true negative rate, the false negative rate, the pass rate, the accuracy, the precision rate, the recall rate and F1 score of AI rules in training group were 22.7%, 1.6%, 74.5%, 1.3%, 75.7%, 97.2%, 93.5%, 94.7%, 94.1, respectively.All of them were better than auto-verification rules, and the difference was statistically significant ( P<0.001), and with no important case missed. In validation group, the true positive rate, the false positive rate, the true negative rate, the false negative rate, the pass rate, the accuracy, the precision rate, the recall rate and F1 score were 19.2%, 8.2%, 70.1%, 2.5%, 72.6%, 89.2%, 70.0%, 88.3%, 78.1, respectively, Compared with the auto-verification rules, The false negative rate was lower, the false positive rate and the recall rate were slightly higher, and the difference was statistically significant ( P<0.001). Conclusion:A set of the AI verification rules are established and verified by using decision tree algorithm of machine learning, which can identify, intercept and prompt abnormal results stably, and is moresimple, highly efficient and more accurate in the report of blood analysis test results compared with auto-vefication.

Objective To investigate the impact of the interaction of fasting blood glucose(FBG)and serum uric acid(SUA)on diabetic retinopathy(DR).Methods A total of 306 diabetes mellitus(DM)patients diagnosed and re-ceived comprehensive ophthalmic examination in the First Affiliated Hospital of Gannan Medical University from January 2019 to January 2021 were selected.According to the presence or absence of DR,these patients were divided into the DR group(178 patients)and the non-DR(NDR)group(128 patients).The general clinical data of patients in the two groups were compared.The least absolute shrinkage and selection operator(LASSO)regression method and multivariate Logistic regression analysis were used to screen the independent influencing factors of DR in DM patients,and the odds ratio of risk factors was calculated.The sensitivity analysis of the results was performed using the E-value method.The interaction of FBG and SUA on DR in DM patients was analyzed by an additive interaction model.The Nomogram model to predict DR in DM patients was constructed and verified internally.The receiver operating characteristic curve(ROC)was used to evalu-ate the effects of FBG,SUA and both FBG and SUA on DR in DM patients.Results Compared with the NDR group,the course of DM in the DR group was significantly longer,the proportion of patients with history of oral medication was signif-icantly lower,the proportion of patients with history of insulin therapy was significantly higher,and the levels of total cho-lesterol,triglyceride,low-density lipoprotein cholesterol,high-density lipoprotein cholesterol,blood urea nitrogen,serum creatinine,SUA and FBG were significantly higher(all P＜0.05).The history of insulin therapy,course of DM≥9.66 years,TG≥2.07 mmol·L-1,SUA ≥ 297.73 μmol·L-1 and FBG ≥8.92 mmol·L-1 were the risk factors for DR in DM pa-tients,while the history of oral medication was the protective factor for DR in DM patients.The Nomogram model based on the above independent risk factors was accurate in predicting the occurrence of DR in DM patients.SUA and FBG had inter-active effects on DR in DM patients.The value of SUA-FBG interaction in the diagnosis of DR was greater than that of both alone.Conclusion SUA≥ 297.73 μmol·L-1 and FBG ≥8.92 mmol·L-1 are the risk factors for DR in DM patients.The value of interaction of FBG and SUA in the diagnosis of DM accompanied by DR is greater than that of both alone.

Objective To develop a teaching strategy which is suitable for training talents and improving teaching quality in field of clinical gynecological oncology.Methods Seventy-eight clinical students of grade 2020 in a medi-cal university were divided into control group(n=38)and research group(n=40).The"3+2"teaching mode of team-based learning(TBL)and workshop(WS)were adopted,and the learning outcome was evaluated at preview preparation,knowledge application and the questionnaire survey of students,so as to promote the cultivation of clinical reasoning of medical students.Results Compared with traditional teaching method,TBL+WS teaching group had better academic performance.The difference of before class tests and final exams was more significant[17.53±6.15 points and(76.81±5.10)points,respectively,P＜0.001].However,among the eight dimensions of the classroom teaching questionnaire,the teaching quality dimension was the highest(97.5%).More students think that this model had a positive effect on cultivating clinical thinking and developing new knowledge.Conclu-sions This integrated teaching strategy improves the quality of obstetrics and gynecology teaching and suppots students'capacity building on clinical reasoning.

Objective To explore the effect of paclitaxel with carboplatin combined chemotherapy on hemocyte re-lated indexes,vascular endothelial growth factor(VEGF)and tumor markers in ovarian cancer(OC)patients.Methods OC patients combined chemotherapy(CC)group and ovarian benign tumor control group with 50 cases in each.The pathological changes in the ovarian cells were observed by HE staining and the expression of VEGF was observed by immunohistochemical staining(IHC).Blood cell was counted by flow cytometry(FC).Serum car-bohydrate antigen 125(CA125)and human epididymal protein 4(HE4)were measured by electrochemical lumi-nescence(ECL).Results Compared with control group,the ovarian tissue structure was disordered and the cell atypia was obvious in OC.VEGF expression was significantly enhanced.Platelet count(PLT),CA125 and HE4 were significantly increased(P＜0.01).However,necrotic cells were observed in ovarian tissue of CC group.VEGF expression was inhibited.PLT count and the level of CA125 and HE4 were significantly lower than those of control group after chemotherapy(P＜0.01).Conclusions Combined chemotherapy may regulate the level of VEGF,CA125 and HE4 in OC patients.

Objective To investigate the gene mutations of Chinese patients with pancreatic cancer in the coastal regions of Eastern China, and to provide a basis for individualized treatment. Methods A total of 40 patients who were admitted and diagnosed with malignant pancreatic tumor after surgical treatment in The Affiliated Hospital of Qingdao University, Qingdao Municipal Hospital, Yantaishan Hospital, and Yantai Sino-France Friendship Hospital from January 2017 to June 2019 were enrolled. Next-generation sequencing (NGS) was used to detect gene mutations in tumor tissue and somatic cells, and the map of gene mutations was plotted to analyze genomic alterations. The chi-square test or the Fisher's exact test was used for comparison of categorical data between groups. The Kaplan-Meier method was used to plot survival curves, and the log-rank test was used for comparison between groups. Results Among the 40 patients, 34 (85.0%) had pancreatic ductal adenocarcinoma, 3 (7.5%) had solid pseudopapillary neoplasm of the pancreas, 1 (2.5%) had pancreatic neuroendocrine tumor, and 2 (5.0%) had unclear typing. KRAS (80.0%, 32/40), TP53 (70.0%, 28/40), CDKN2A (32.5%, 13/40), SMAD4 (17.5%, 7/40), and AKT2 (17.5%, 7/40) were the most common mutations, and there was no significant difference in survival time between the patients with these five common gene mutations (all P > 0.05). Conclusion NGS technology can provide comprehensive and accurate information of genomic alterations and may provide novel potential biomarkers for the diagnosis and precise treatment of pancreatic cancer. The analysis of mutant genes also lays a foundation for the individualized treatment of pancreatic cancer.

Objective:To develop the discrimination experience questionnaire for HIV/acquired immunodeficiency syndrome(AIDS) patients and test the reliability and validity of the questionnaire.Methods:Based on the literature review and semi-structured interviews to clarify the operational definition of discrimination for HIV/AIDS and develop the item pool. The questionnaire was developed though 2 rounds Delphi consultation and a pilot test. A total of 410 HIV/AIDS patients in Shanghai Public Health Clinical Center of Fudan University from June to December 2020 were selected to investigate the questionnaire, item analysis was used to screen items. SPSS 22.0 software was used for reliability test and exploratory factor analysis, the AMOS 21.0 software was used for confirmatory factor analysis to test the reliability and validity of the questionnaire.Results:The questionnaire consisted 2 dimensions(external discrimination and internal discrimination) and 10 items. Exploratory factor analysis showed that two common factors were extracted from the frequency of discrimination and the degree of negative psychological impact of discrimination experience on patients, and the cumulative variance contribution rates were 48.367% and 55.403%, respectively. The confirmatory factor analysis on the frequency of discrimination showed that Chi square degree of freedom ratio ( χ2/ df) was 2.831, P<0.05, root mean square of approximation error (RMSEA) was 0.093, goodness of fit index (GFI) was 0.928, comparative fit index (CFI) was 0.925, incremental fit index (IFI) was 0.926; the confirmatory factor analysis on the negative psychological impact of discrimination experience on patients showed that χ2/ df was 1.740, P<0.05; RMSEA was 0.076, GFI was 0.925, CFI was 0.936, IFI was 0.938. The content validity of the questionnaire was 0.9. The Cronbach α coefficientof questionnaire was 0.811, and the test-retest coefficient was 0.862 ( P<0.01). Conclusions:The discrimination experience questionnaire for HIV/AIDS patients has good reliability and validity, and it can be used to measure the discrimination for HIV/AIDS patients.

Objective : To assess the safety and feasibility of incision in the retroauricular sulcus for removal of benign tumors in the lower pole of the parotid gland and to provide some ideas for aesthetic consideration of parotidectomy. Methods: In total, 18 cases with benign tumors of the lower pole regions of the parotid gland were included in this study, including 9 pleomorphic adenomas, 2 myoepitheliomas, 5 Warthin tumors, 1 basal cell adenoma and 1 oncocytoma. Three months after the operation, facial paralysis and salivary fistula were assessed. A visual analog scale was used to score the cosmetic satisfaction of the surgical incision. Tumor recurrence was followed up 6 ~ 12 months after operation. Results: In 18 patients with benign tumors the lower pole regions of the parotid gland, the tumor diameter ranges from 1.0 to 3.1 cm, with an average value of 2.5 cm. All patients experienced successful complete removal of the parotid mass with the minimally invasive retroauricular approach, and all wounds healed in one stage after operation. No serious complications, such as permanent facial paralysis and tumor recurrence, occurred 3 months after the operation. The patients were satisfied with the appearance of the surgical incision (aesthetic score 9.3 ± 0.4), achieving the expected aesthetic effect. Conclusion This approach is feasible and safe for most small benign parotid tumors located in the lower pole region of the parotid gland and in the posterior region of the jaw. The scar is located in the retroauricular sulcus, which significantly meets the aesthetic needs of the concealed incision for patients.

Objective Using small interfering RNA (siRNA) against p38 and simulated lung transplantation model,we discussed the effect of p38 siRNA on hypoxia/reoxygenation injury of pulmonary microvascular endothelial cells (PMVECs) after lung transplantation.Methods We transfected the PMVECs with p38 siRNA or non-targeting (NT) siRNA.After 48 h,these cells were exposed to simulated ischemia-reperfusion.At 2 h and 4 h of reperfusion,we detected lactate dehydrofenase (LDH) leakage rate,malondialdehyde (MDA) levels,superoxide dismutase (SOD) activity,cell apoptosis,and the serum levels of interleukin (IL)-1,IL-6 and tumor necrosis factor (TNF)-α.Protein levels of p38,NF-κB and AP-1 were detected.Untreated PMVECs served as the negative control.Results As compared with NT siRNA,p38 siRNA reduced LDH leakage rate (22.3 ± 5.7 vs.45.1 ± 6.2 and 46.3 ± 7.3 vs.75.6 ± 12.4),decreased MDA levels (4.1 ± 2.2 vs.7.1 ± 2.1 and 3.9 ± 0.5 vs.6.1 ± 1.2),increased SOD activity (12.8 ± 3.2 vs.9.4 ± 1.1 and 10.8 ± 1.2 vs.7.0 ± 1.1),and inhibited apoptosis (2.8 ± 0.6 vs.4.1 ± 1.4 and 3.1 ± 1.1 vs.5.8 ± 1.3).p38 siRNA reduced the levels of IL-1 (288 ± 89 vs.592 ± 95 and 380 ± 94 vs.775 ± 175) and IL-6 (38 ± 5 vs.70 ± 12 and 80 ± 20 vs.118-± 17),however,had no influence on TNF-α level.Silencing p38 gene decreased phosphorylation of p65 and inhibitor of nuclear factor kappa-B kinase β,and increased inhibitor of nuclear factor kappa-B expression.However,p38 siRNA had no effect on the phosphorylation of c-Jun and c-Fos.Conclusion Through inhibiting the NF-κB classic activation pathway,p38 siRNA reduced oxidative stress,inflammation and apoptosis of rat PMVECs,protected membrane integrity,and reduced hypoxia/reoxygenation injury.