Abstract: To explore the latent profiles of physical activity among junior and senior high school students and the association with short-video addiction, so as to provide evidence for the prevention of short-video addiction among adolescents. Methods: In November 2024, a stratified random sampling method was used to select 20 840 students from 120 junior and senior high schools in Guangdong Province. Physical activity and short-video addiction were assessed using International Physical Activity Questionnaire and Short-video Addiction Scale. Latent profile analysis was used to identify latent classes of physical activity. The robust three-step approach was used to examine the effects of demographic variables, including sex, school stage, age, and residence, on profile membership, and the Bolck-Croon-Hagenaars (BCH) method was used to compare short-video addiction levels across profiles after adjusting for demographic variables. Results: Four latent profiles of physical activity in junior and senior high school students were identified:low-frequency low-duration profile ( n =1 668, 8.00%), weekday high-frequency activity profile ( n = 12 408 , 59.54%), weekday low-frequency activity profile ( n =5 107, 24.51%), and high frequency high-duration profile ( n = 1 657 , 7.95%). With the high-frequency high-duration profile as the reference, girls were more likely to be assigned to the weekday high-frequency activity profile and less likely to be in the low-frequency low-duration profile compared with boys ( B =0.27, -0.33 ); senior high school students had higher odds of membership in the other three profiles than junior high school students ( B =0.63- 1.09 ); increasing age was associated with increased odds of the low-frequency low-duration profile ( B =0.11); rural students were less likely to belong to the other three profiles than urban students ( B =-0.97 to -0.79) (all P <0.01). After adjusting for demographic variables, short-video addiction scores differed significantly across physical activity profiles in junior and senior high school students ( χ 2=390.23, P <0.01), with scores decreasing in the following order:low-frequency low-duration profile, weekday low-frequency activity profile, weekday high-frequency activity profile, and high-frequency high-duration profile. Conclusions Short-video addiction levels vary across different physical activity patterns in junior and senior high school students. Overall, participants with high-frequency and high-duration participation score the lowest, whereas those with low-frequency and low-duration participation score the highest.

Objective To compare the consistency of voice parameters collected by commonly used smart-phone brands in China and professional recording equipment,and to study whether smartphones can be used for voice research.Methods A total of 67 normal subjects were selected for voice recording using six different smart-phone brands(via the"Active Health"screening APP from the National Key Research and Development Program)and professional recording equipment.Acoustic voice parameters such as fundamental frequency parameters,fre-quency variation parameters,amplitude variation parameters,formant parameters,and energy parameters were ex-tracted from the vowels/a/,/i/,and/u/.A one-way ANOVA test and Tukey's HSD post-hoc comparisons were conducted on the independent variables.Results There were no significant differences between smartphones and professional recording equipment in terms of fundamental frequency parameters such as median F0,mean F0,max F0 and min F0;frequency parameters such as jitter local,jitter local absolute,jitter rap,jitter ppq5,and jitter ddp;amplitude parameters such as shimmer local,shimmer local dB,shimmer apq3,shimmer apq5,shimmer apq11,and shimmer dda;and formant parameters such as F1,F2,F3,and F4.However,significant differences were found in energy parameters such as mean energy(F=31.171,P＜0.001),max energy(F=34.193,P＜0.001),and min energy(F=5.453,P＜0.001)between smartphones and professional recording equipment.Conclusion The smartphones using the"Active Health"screening app from the National Key Research and Development Program can replace professional recording equipment for voice research.However,caution should be exercised when selec-ting energy-related acoustic parameters.

Objective To compare the consistency of voice parameters collected by commonly used smart-phone brands in China and professional recording equipment,and to study whether smartphones can be used for voice research.Methods A total of 67 normal subjects were selected for voice recording using six different smart-phone brands(via the"Active Health"screening APP from the National Key Research and Development Program)and professional recording equipment.Acoustic voice parameters such as fundamental frequency parameters,fre-quency variation parameters,amplitude variation parameters,formant parameters,and energy parameters were ex-tracted from the vowels/a/,/i/,and/u/.A one-way ANOVA test and Tukey's HSD post-hoc comparisons were conducted on the independent variables.Results There were no significant differences between smartphones and professional recording equipment in terms of fundamental frequency parameters such as median F0,mean F0,max F0 and min F0;frequency parameters such as jitter local,jitter local absolute,jitter rap,jitter ppq5,and jitter ddp;amplitude parameters such as shimmer local,shimmer local dB,shimmer apq3,shimmer apq5,shimmer apq11,and shimmer dda;and formant parameters such as F1,F2,F3,and F4.However,significant differences were found in energy parameters such as mean energy(F=31.171,P＜0.001),max energy(F=34.193,P＜0.001),and min energy(F=5.453,P＜0.001)between smartphones and professional recording equipment.Conclusion The smartphones using the"Active Health"screening app from the National Key Research and Development Program can replace professional recording equipment for voice research.However,caution should be exercised when selec-ting energy-related acoustic parameters.

Objective:To explore the high-risk factors for parenteral nutrition associated cholestasis（PNAC）in extremely/ultra-low birth weight infants，and establish a risk Alignment Diagram prediction model.Methods:We retrospectivly analyzed the clinical data of hospitalized extremely/ultra-low birth weight infants admitted to Neonatology Department at Quanzhou Children's Hospital from January 2019 to December 2020，using multivariate Logistic regression analysis to screen for independent risk factors for the occurrence of PNAC.An Alignment Diagram model prediction model for PNAC was constructed by using R software，and the performance of the model was evaluated through receiver operating characteristic curves.Results:A total of 203 extremely/ultra-low birth weight infants were included，with a median gestational age of 29.14（28.00，30.86）weeks and a median birth weight of 1　170（1　000,1　300）g.Among them，26（12.81%）cases developed PNAC.Multivariate Logistic regression analysis showed that the duration of parenteral nutrition（ OR=1.015 ，95% CI 1.003-1.034），the cumulative amount of glucose（ OR=1.014 ，95% CI 1.001-1.028），small for gestational age（ OR=3.455 ，95% CI 1.127-10.589），and neonatal sepsis（ OR=3.142 ，95% CI 1.039-9.503）were independent risk factors for PNAC（ P＜0.05）；The four independent risk factors mentioned above were introduced into R software to construct an Alignment Diagram model，the area under the receiver operating characteristic curve was 0.835（95% CI 0.842-0.731），and the results of the Hosmer Limeshow goodness of fit test show that：χ 2=5.34，degree of freedom=8， P=0.72.A calibration curve indicated good consistency between the predicted probability of the model and the actual occurrence rate，with good accuracy. Conclusion:The Alignment Diagram model constructed based on four independent risk factors of the duration of parenteral nutrition，glucose accumulation，small for gestational age infants，and neonatal sepsis exhibits high predictive ability，and is expected to provide an intuitive and convenient visualization tool for preventing or reducing the occurrence of PNAC in extremely/ultra-low birth weight infants

Background Previous research indicated that isomers and alternatives of per- and polyfluoroalkyl substances (PFAS) probably disturb glucose metabolism; however, current epidemiological evidence on the associations of PFAS with fasting blood glucose is inconsistent. Besides, studies on the joint association of multiple components of PFAS and fasting blood glucose as well as the key component are scarce. Objective To evaluate the associations of PFAS isomers and alternatives with fasting blood glucose and their joint effects, as well as identify the key component among population without glucose metabolism problems. Methods We selected 923 adults without glucose metabolism problems or missing data from the Isomers of C8 Health Project in China (2015—2016). Serum PFAS isomers and alternatives and fasting blood glucose were measured using ultra-performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) and automatic biochemical analyzer. We applied multiple linear regression to explore the associations of 16 pollutants which were detected among over 80% participants with fasting blood glucose. Meanwhile, we utilized qgcomp and Bayesian kernel machine regression (BKMR) models to explore the joint effects of PFAS isomers and alternatives mixture on target outcome indicators and identify the key component. Results The average age among the 923 participants in this study was (62.4±13.8) years old, including 472 men (51.1%) and 451 women (48.9%). Among selected PFAS isomers and alternatives, the highest serum concentration was ∑3+4+5m-PFOS (perfluoro-3/4/5-methylheptanesulfonate) with a median concentration of 10.20 ng·mL⁻¹. The concentrations of linear perfluorooctane sulfonate (n-PFOS, 9.61 ng·mL⁻¹), perfluorooctanoic acid (PFOA, 4.55 ng·mL⁻¹), linear perfluorohexane sulfonic acid (n-PFHxS, 2.48 ng·mL⁻¹), 6:2 chlorinated polyfluorinated ethersulfonic acid (6:2 Cl-PFESA, 1.90 ng·mL⁻¹), perfluoro-6-methylheptanesulfonate (iso-PFOS, 1.85 ng·mL⁻¹), perfluorobutanoic acid (PFBA, 1.81 ng·mL⁻¹), perfluorinated n-nonanoic acid (PFNA, 1.39 ng·mL⁻¹), and perfluoro-1-methylheptanesulfonate (1m-PFOS, 1.27 ng·mL⁻¹) were higher than 1.00 ng·mL⁻¹. After being adjusted for selected confounders, PFAS isomers and alternatives were positively associated with fasting blood glucose. With 1 ln unit concentration increment of 6:2 Cl-PFESA and PFNA, the estimated changes of fasting blood glucose were 0.18 (95%CI: 0.13, 0.23) mmol·L⁻¹ and 0.24 (95%CI: 0.18, 0.30) mmol·L⁻¹, respectively. The multi-pollutant models indicated a joint association of PFAS isomers and alternatives mixture with fasting blood glucose. The BKMR models reveals that as the quantiles of mixture elevated from the 50^th to the 75^th percentile, the values of fasting blood glucose increased 0.25 (95%CI: 0.21, 0.30) mmol·L⁻¹, and the posterior inclusion probability of PFNA was 0.92, implying that PFNA was the key component. Conclusion PFAS isomers and alternatives are positively associated with fasting blood glucose. PFNA is the key component of the joint association.

Objective:To evaluate the teaching effectiveness of independent experimental design from students' active learning behavior, and further provide the basis for advancing the reform of functional experimental teaching and teaching quality.Methods:In June 2019, 186 undergraduates (5-year-programme and 8-year-programme) of Xiangya School of Medicine were included in the teaching research. Self-administered questionnaires were applied to characterize students' active learning behavior in independent experimental design education. Spearman rank correlation analysis and Logistic regression analysis were used in the study. SPSS 23.0 was used for descriptive analysis of the data.Results:During the independent experimental design, 85.0%(158/186) of the students thought it was necessary and important to conduct independent experimental design education; 72.6%(135/186) of the students tentatively raised new scientific questions; 97.8%(182/186) of the students actively searched literature; 77.4%(144/186) of the students participated in reply positively. The value of correlation coefficient of actively learning behavior "tentatively raising new science questions" and teaching effectiveness "improving the ability of scientific thinking" was 0.81. And only 42.5%(79/186) of the students agreed that students needed to summarize after reporting.Conclusion:Independent experimental design education is welcomed and widely accepted by students, which has effectively improved the capacity for scientific research and innovation spirit of students. Whether students' active learning behavior can be fully mobilized in the education practice is closely related to the teaching effect. And the cultivation of leadership and leading consciousness still need to be improved.

Background Chronic low-level exposure to lead can damage the central nervous system and cause anxiety-like behavior. However, whether changes of blood metabolites occur in this process and its relationship with lead-induced neurobehavioral disorder remain unclear. Objective To explore the effects of chronic lead acetate (PbAc) exposure at different concentrations on anxiety-like behavior and serum metabolites and their relationships in mice, as well as the mechanism of lead exposure on neurobehavioral injury in mice from the perspective of metabolomics. Methods A total of 64 healthy 4-week-old C57BL/6J mice, half male and half female, were randomly divided into four groups: control group (normal drinking water), 20 mg·L⁻¹ PbAc group, 100 mg·L⁻¹ PbAc group, and 500 mg·L⁻¹ PbAc group. After 10 weeks of free drinking of water containing designed concentrations of PbAc, the mice were tested for anxiety-like behavioral changes by open field experiment. After the mice were anesthetized, blood was collected from the eyes, the serum was separated, and the effects of designed doses of lead exposure on metabolites in the serum of mice were compared by liquid chromatography with tandem mass spectrometry combined with principal component analysis and partial least squares discrimination analysis. Results The results of the open field experiment showed that the reductions in movement time spent in central area in the 100 mg·L⁻¹ and 500 mg·L⁻¹ PbAc groups compared with the control group were of statistical significance (P<0.05); the reduction in crossing times of central region in the 500 mg·L⁻¹ PbAc group was statistically significant compared with the control group (P<0.05); the increases in defecation frequency in the 100 mg·L⁻¹ and 500 mg·L⁻¹ PbAc groups were statistically significant compared to the control group (P<0.05). In both positive and negative ion modes, compared with the control group, 157 differential metabolites were screened out in the 20 mg·L⁻¹ PbAc group, of which 80 were up-regulated and 77 were down-regulated; 172 differential metabolites were screened out in the 100 mg·L⁻¹ PbAc group, of which 57 were up-regulated and 115 were down-regulated; 119 differential metabolites were screened out in the 500 mg·L⁻¹ PbAc group, of which 42 were up-regulated and 77 were down-regulated. The results of the KEGG enrichment analysis on the differential metabolites revealed alterations in metabolic pathways mainly involving primary bile acid biosynthesis, bile secretion, and cholesterol metabolism. Among the differential metabolites, norethisterone was positively correlated with the number of central region crossings (r=0.406, P<0.05); dihydrothymine was negatively correlated with the number of central region crossings (r=−0.346, P<0.05); lysophosphatidylcholine 22∶1 and lysophospholipid 14∶0 were negatively correlated with time spent in central region (r=−0.429, P<0.05; r=−0.374, P<0.05). Conclusion Chronic lead exposure induces anxiety-like behavior in mice, and this altered behavior is associated with altered metabolites in serum, with differential metabolites enriched primarily in the metabolic pathways of primary bile acid biosynthesis, bile acid secretion, and cholesterol metabolism.

Objective: To investigate the status of self-measurement of body weight in overweight and obese adults in China and identify the related factors. Methods: A total of 87 670 adults were enrolled in this study, who were selected through multi stage cluster random sampling from 177 099 residents aged ≥18 years in 302 surveillance areas in China where the fourth chronic non-communicable disease and related factor surveillance project was conducted in 2013. The information about their demographic characteristics and body weight measurement were collected by using questionnaire. Their body height, body weight, waist circumstance and blood pressure were measured respectively through physical examination. Fasting venous blood samples were obtained and assayed for FPG, TC, TG, LDL-C and HDL-C levels. Venous blood samples after 75 g glucose intake were obtained and assayed for OGTT-2h level. The proportion of self-body weight measurement were analyzed after complex sample weighting. Results: The proportion of overweight and obese adults who had self-body weight measurement within 1 week, 1 month and 1 year were 18.9%, 23.0% and 30.2%, respectively. The proportion of those having self-body weight measurement within 1 week was higher in men than in women, and lowest in ≥60 years old group (P<0.05). The proportion of overweight and obese adults who had never measured their body weight was 20.5%, the proportion was higher in women than in men, and highest in ≥60 years old group (P<0.05). Older age (OR=0.73, 95%CI: 0.64-0.82) was risk factor for self-body weight measurement; female (OR=1.11, 95%CI: 1.03-1.19), higher education level (junior college and above OR=3.79, 95%CI: 2.89-4.97), high- income (OR=1.61, 95%CI: 1.31-1.98), dyslipidemia (OR=1.13, 95%CI: 1.04-1.23), diabetes (OR=1.15, 95%CI: 1.03-1.30) were the protective factors for self-body weight measurement. Conclusion It is necessary to promote self-body weight measurement in overweight and obese adults in China. Targeted health education should be carried out for different groups to encourage regular self-body weight measurement to maintain healthy body weight.

Objective: To understand the control attempts of body weight and its related factors among overweight and obese adults in China. Methods: Data was from the 2013 Chinese Chronic Diseases and Risk Factors Surveillance Program, which covered 302 surveillance sites. 179 570 adults, selected through multistage stratified cluster sampling method, were interviewed. Demographic characteristics and weight-control attempts were collected via face-to-face interview. BMI, waist circumstance and blood pressure were individually measured under physical examination. Venous blood samples were obtained and tested for FPG, OGTT-2h, TC, TG, LDL-C and HDL-C. A total of 87 545 overweight and obese patients were included in this study, with the exclusion of 152 patients having the missed critical information. Rates on weight control and attempts were analyzed, using the complex weighting on samples to represent the overall overweight and obese adults in China. Results: The rate of weight-control attempts was 16.3% (95%CI: 14.9%-17.7%). Among all the 12 133 patients who had undergone weight-control measures, the proportions of different attempts were as follows: diet (40.9%, 95%CI: 38.4%-43.3%), combination of diet and physical activity (31.5%, 95%CI: 28.9%-34.0%), physical activity (22.8%, 95%CI: 21.0%-24.6%) and drug control (1.3%, 95%CI: 1.0%-1.7%). Factors as: being female (OR=1.26, 95%CI: 1.15-1.38), at younger age (18-44 years old, OR=1.51, 95%CI: 1.31-1.74), with high education levels (college degree or above, OR=4.52, 95%CI: 3.76-5.43), having high annual income (≥24 000 Yuan, OR=1.94, 95%CI: 1.63-2.30) etc., appeared as favorable factors for taking the measures vs. rural residency (OR=0.63, 95%CI: 0.55- 0.72) as the unfavorable one. Conclusion The rate of weight-control attempts appeared low among the overweight and obese adults who were affected by factors as age, education and income level. Personalized intervention measures should be carried out for people with different characteristics.

Objective To investigate the substantia nigra (SN) and brainstem raphe (BR) echogenic features of Parkinson's disease (PD) patients with musculoskeletal pain.Methods A total of 115 PD patients recruited in the Second Affiliated Hospital of Soochow University from October 2014 to May 2016 were assessed with the following rating scales:Unified Parkinson's Disease Rating Scale (UPDRS),Hoehn and Yahr Staging Scale (H/Y),Hamilton Rating Scale for Depression (HRSD),Beck Depression Inventory Ⅱ (BDI-Ⅱ) and Visual Analogue Scale (VAS).All the subjects underwent transcranial sonography during the clinical evaluation.And the patients were divided into PD with musculoskeletal pain (n =54) and PD without musculoskeletal pain (n =61) groups,or PD with depression(n =74) and PD without depression(n =41) groups.Results Compared with PD patients without pain,PD patients with musculoskeletal pain had higher scores of UPDRS-Ⅱ,-Ⅲ,HRSD,BDI,NMSQ and H/Y (UPDRS-Ⅱ score:12.56 ±6.01 vs 8.79 ±4.38,t =-3.801,P ＜0.01;UPDRS-Ⅲ score:24.43 ± 12.43 vs 20.07 ± 11.12,t=-1.986,P=0.049;HRSD score:11.65-±6.94 vs 8.38-±5.36,t=-2.844,P=0.005;BDI score:14.09 ±6.20 vs 9.74 ±6.00,t =-3.826,P ＜0.01;NMSQ score:8.57 ± 4.06 vs 5.60 ± 3.38,t=4.193,P＜0.01;H/Y:2.0(1.5,2.6) vs 1.5(1.0,2.0),Z=-3.011,P=0.003).Positive BR was more frequent in depressed than in non-depressed PD patients without pain (63.6％ vs 14.3％;x2 =15.25,P ＜0.01).Positive BR was positively associated with sex(r =0.228,P =0.014),age(r =0.184,P =0.049),disease duration (r =0.196,P =0.035),and depression (r =0.396,P ＜ 0.01).However,positive BR did not correlate with musculoskeletal pain.No correlation was found between positive SN and clinical characteristics of PD patients.Conclusions PD patients with musculoskeletal pain have worse activity of daily living,more severe motor symptoms,more non-motor symptoms,and are more depressed.SN and BR echogenecity do not correlate with musculoskeletal pain,however,hypoechogenic or interrupted BR is associated with depression in PD patients.