Objective:To establish HPLC fingerprint and methods for determining the contents of four iridoid glycosides of Gentiana rigescens; To evaluate the quality of Gentiana rigescens from different origins; To improve the quality control level of Gentiana rigescens medicinal materials.Methods:Using 15 batches of Gentiana rigescens from the main production areas and authentic production areas as raw materials, the common mode of HPLC fingerprints of Gentiana rigescens was established, and the chemical components of the common peaks were identified. Referring to the common mode of fingerprints, similarity analysis was conducted on the fingerprints of Gentiana rigescens from different origins. Using chemometric methods, cluster analysis (HCA), principal component analysis (HCA), and orthogonal partial least squares discriminant analysis (OPLS-DA) were performed on 15 batches of Gentiana rigescens, with the common peak area of fingerprint as the variable. The contents of four types of iridoid glycosides in Gentiana rigescens were determined. Combined with the fingerprints and the content results of four types of iridoid glycosides, the quality of Gentiana rigescens from different origins was evaluated.Results:The fingerprints of Gentiana rigescens contained 9 common peaks, with 4 identified iridoid glycosides. The similarity of the fingerprints of 15 batches of Gentiana rigescens ranged from 0.962 to 0.999. HCA and PCA divided the 15 batches of Gentiana rigescens into two categories. OPLS-DA analyzed 3 significantly different components, namely gentiopicroside, peak 7, and loganic acid. The content determination results showed that the average contents of loganic acid, swertiamarin, and gentiopicroside in Gentiana rigescens from Dali Bai Autonomous Prefecture and Yunnan Province were the highest, and the total amount of four iridoid glycosides was also significantly higher than that from other regions, indicating that the overall quality of Gentiana rigescens from Dali Bai Autonomous Prefecture and Yunnan Province was relatively good.Conclusion:This method is simple, fast, accurate, and can provide reference for improving the quality standards of Gentiana rigescens.

ObjectiveTo evaluate the quality of Lygodium japonicum (Thunb.) Sw. (L. japonicum, Hai Jin Sha) by comparing its components without stewed (W) and stewed (S) using ultra-high-performance liquid chromatography (UHPLC) and chemometric analysis. Additionally, network pharmacology was employed to investigate the possible mechanisms of action of L. japonicum in the urinary calculi (UC) treatment.MethodsA fingerprinting method was established to identify components through UHPLC-tandem mass spectrometry. Chemometric techniques were used to compare the L. japonicum extraction methods. Furthermore, various network pharmacological approaches were used to identify and analyze the potential targets of the identified components in relation to UC.ResultsThe W and S extracts were distributed into two distinct clusters. Significant differences in the levels of protocatechuic aldehyde, caffeic acid, and p-coumaric acid were observed between S and W. Network pharmacology analysis revealed that the primary targets of L. japonicum in the UC treatment were serum albumin and epidermal growth factor receptors, with potential active components including protocatechuic acid and caffeic acid.ConclusionThis study comprehensively examined the therapeutic components of L. japonicum before and after boiling, shedding light on its potential mechanisms of action in UC treatment. These findings offer valuable insights into the development and utilization of L. japonicum resources.

Objective:To investigate the risk factors and construct a nomogram prediction model for neonatal bacterial meningitis (BM).Methods:A retrospective cohort study was conducted on 1 228 neonates who underwent lumbar puncture for cerebrospinal fluid examination in the Department of Neonatology at Gansu Provincial Women and Child Healthcare Hospital from December 2019 to February 2024. The subjects were randomly divided into a training cohort and a validation cohort at a ratio of 7∶3 using a computer program. Rank sum test or Chi-square tests were used to compare differences between the two cohorts. The subjects were divided into BM and non-BM groups based on the presence or absence of BM. Multivariate logistic regression analysis (forward stepwise regression method) was used in the training cohort to identify risk factors for BM. The area under the receiver operating characteristic curve (AUC) and the Hosmer-Lemeshow goodness-of-fit test were used to assess the discrimination and calibration of the model, respectively. Calibration curves were used to evaluate the accuracy of the model and to construct the nomogram. Internal validation was performed using the Bootstrap resampling method. Decision curve analysis was used to assess the clinical utility of the model. Results:Among the 1 228 neonates, 151 (12.3%) had BM. The training cohort included 859 neonates, of whom 106 (12.3%) had BM and 753 (87.7%) did not. The validation cohort included 369 neonates, of whom 45 (12.2%) had BM and 324 (87.8%) did not. The results of the multivariate logistic regression analysis in the training cohort showed that sepsis ( OR=4.446, 95% CI:2.583-7.653), convulsions ( OR=3.749, 95% CI:1.930-7.280), high maximum body temperature ( OR=2.027, 95% CI:1.636-2.513), and elevated C-reactive protein ( OR=1.007, 95% CI:1.003-1.012) were independent risk factors for BM, while greater gestational age at birth ( OR=0.946, 95% CI: 0.898-0.995) and higher hemoglobin levels ( OR=0.990, 95% CI:0.981-0.998) were protective factors for BM (all P<0.05). Based on these findings, a nomogram prediction model for neonatal BM was constructed and validated for accuracy. The AUC values of the nomogram model in the training and validation cohorts were 0.796 (95% CI: 0.750-0.843) and 0.781 (95% CI: 0.700-0.862), respectively. The Hosmer-Lemeshow goodness-of-fit test showed P>0.05 in both cohorts. The clinical decision curve analysis demonstrated good net benefit across most threshold ranges. Conclusions:Sepsis, convulsions, high maximum body temperature, and elevated C-reactive protein increase the risk of neonatal BM. The nomogram model constructed based on these factors, combined with gestational age and hemoglobin levels, provides a reference value for predicting the risk of neonatal BM.

Objective:To analyze the accuracy of nine estimation methods for umbilical venous catheterization (UVC) insertion depth in neonates.Methods:This prospective study enrolled neonates who underwent successful UVC placement in the Department of Neonatology at Gansu Provincial Women and Child Healthcare Hospital between September 2023 and October 2024. The standard catheter tip position was defined as the junction of the inferior vena cava and right atrium, with a deviation of ≤0.5 cm considered accurate. Patients were stratified by birth weight (BW) into three groups: <1 500 g, 1 500- 2 499 g, and ≥2 500 g. The actual UVC depth was compared with depths estimated using nine methods: Shukla formula, modified Shukla formula, JSS formula, BW formula, Tambasco formula, modified Tambasco formula, Dunn's nomogram, body surface measurement, and ultrasonographic measurement. Accuracy was evaluated using nonparametric tests and Bland-Altman agreement analysis.Results:The study included 111 neonates: 41 (36.9%) in the <1 500 g group, 55 (49.6%) in the 1 500-2 499 g group, and 15 (13.5%) in the ≥2 500 g group. In the <1 500 g group, accuracy rates ranged from 24% to 56%, with body surface measurement showing the highest accuracy (56%); the mean difference from actual depth was－0.073 cm, with 95% limits of agreement (LOA) of－1.764 to 1.618 cm. In the 1 500-2 499 g group, accuracy rate ranged from 15% to 51%, with the modified Tambasco formula being most accurate (51%); the mean difference was 0.113 cm (95%LOA:－1.558-1.783 cm). In the ≥2 500 g group, accuracy rate ranged from 0/15 to 10/15, with Dunn's nomogram being most accurate (10/15); the mean difference was－0.120 cm (95%LOA:－1.380-1.140 cm).Conclusions:The accuracy of the nine UVC depth estimation methods varied across different BW groups and among methods within the same group. Selection of an estimation method should be tailored to the neonate's birth weight.

Objective Based on the"preventive treatment of disease"theory and real-world data,this study aimed to evaluate the clinical efficacy of Yangyin Shugan Formula in patients with ovarian dysfunction characterized by the syndrome of kidney deficiency and liver depression at different stages and to provide evidence for optimizing the timing of traditional Chinese medicine(TCM)in premature ovarian insufficiency(POI)management.Methods Ovarian dysfunction patients under 40 years old characterized by syndrome of kidney deficiency and liver depression,registered in the outpatient electronic medical records of the Second Affiliated Hospital of Guangzhou University of Chinese Medicine from January 2020 to December 2023,were stratified into three groups:subclinical POI,POI,and premature ovarian failure(POF)groups.The therapeutic outcomes of the three groups of patients were compared,including TCM syndrome total response rates,menstrual total response rates/normalization(cured)rates,base follicle-stimulating hormone(FSH)total response rate/normalization rates and anti-Müllerian hormone(AMH)levels.Results A total of 307 patients meeting the research criteria were included(97 cases in subclinical POI group,112 cases in POI group,and 98 cases in POF group).The TCM syndrome total response rates ranked as subclinical POI group(98.97%,96/97)>POI group(95.54%,107/112)>POF group(83.67%,82/98),with the POF group was lower than that of the subclinical POI and POI groups(P<0.017);while the difference of the subclinical POI group with the POI group was not significant.Menstrual total response rates ranked as subclinical POI group(97.22%,70/72)>POI group(72.32%,81/112)>POF group(51.02%,50/98),the differences among the three groups and in the post-hoc comparisons were significant(P<0.01,P<0.017);normalization rates ranked as subclinical POI group(90.28%,65/72)>POI group(54.46%,61/112)>POF group(26.53%,26/98),the differences among the three groups and in the post-hoc comparisons were significant(P<0.01,P<0.017).FSH total response rates ranked as subclinical POI group(89.69%,87/97)>POI group(81.25%,91/112)>POF group(60.20%,59/98),while POF group was lower than that of the other two groups(P<0.017),and the difference of the subclinical POI group with the POI group was not significant.Normalization FSH rates ranked as subclinical POI group(71.13%,69/97)>POI group(53.57%,60/112)>POF group(16.33%,16/98),the differences among the three groups and in the post-hoc comparisons were significant(P<0.01,P<0.017).Compared with before treatment,the FSH levels in all three groups decreased after treatment(P<0.01).The reduction of FSH in the POF and POI groups were better than that in the subclinical P OI group(P<0.017).No significant difference was observed in the reduction of FSH between the POI and POF groups.Post-treatment AMH elevation observed in the subclinical POI and POI groups(P<0.01).Conclusion Yangyin Shugan Formula improves the menstrual conditions and TCM syndromes across all the stages.It also improves elevated FSH levels across all the stages and has a specific effect on normalizing FSH and menstruation.Yangyin Shugan Formula increases the AMH levels of patients with subclinical POI and POI,highlighting the applicability of TCM in staged preventive management.

AIM:Hepatotoxicity of Brucea javani-ca picryl with broad-spectrum anticancer effect in nude mice based on hepatic drug metabolizing en-zyme CYP450 activity.METHODS:Fifty-six nude mice were randomly divided into blank group,Bru-cea javanica low-dose group(2 mg/kg),Brucea ja-vanica high-dose group(4 mg/kg),and cisplatin group(2 mg/kg),with 14 mice in each group.The blank group was injected with the same amount of normal saline every 3 days for 6 weeks.Calculate the mortality rate of nude mice in each group,ob-serve the general growth state of nude mice,re-cord the weight change of nude mice before and af-ter administration,weigh and record the liver weight after taking materials,and calculate the liv-er coefficient(liver weight/weight mass×100％),ob-serve and record the liver color and morphology.Hematoxylin-eosin(HE)staining was used to ob-serve the pathological changes of liver tissue.De-tection of alanine aminotransferase(ALT),aspar-tate aminotransferase(AST),lactate dehydrogenase(LDH),alkaline phosphatase(AKP)and albumin(ALB)levels in serum of nude mice by ELISA.Real-time PCR and Western blot were used to detect the mRNA and protein expression levels of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6 and CYP2C9,which were key enzymes of drug metabolism in nude mice liver.RESULTS:Compared with the blank group,the mortality rate of nude mice in the low-dose Brucea javanica bitter alcohol group was 0,the growth state was good,the diet,movement,and mental state were normal,the weight change and liver coefficient ratio were consistent,the liver color was ruddy,the liver lobule morphology was complete under the microscope,the structure was clear,the liver cells were arranged regularly,and there was no inflammatory cell infiltration.There was no significant difference in the content of ALT,AST,LDH,AKP,and ALB.There was no significant difference in the mRNA and protein expression of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6,and CYP2C9(all P＞0.05).Compared with the blank group,the mortality rate of nude mice in the high-dose group of Brucea javanica bitter alcohol was 14.3％,the growth state was slightly poor,the diet,movement,and mental state were reduced,the weight growth was slow,the liver coefficient ratio was increased,the liver color was reddish brown,some liver lobule boundaries were unclear,a small number of liver cells were loosely arranged,the contents of ALT,AST,LDH,AKP,and ALB were signif-icantly increased,the mRNA levels of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6,and CYP2C9 were significantly reduced,and the protein expres-sions of CYP2E1,CYP3A11,CYP1A2,and CYP2D6 were significantly reduced(all P＜0.05 or P＜0.01),but there was no statistical difference in the mRNA and protein expression of CYP2C19,and the pro-tein expression of CYP2C9(P＞0.05).Compared with the blank group,the mortality rate of nude mice in the cisplatin group was 35.7％,the growth state was poor,the diet,action,and mental state were low,the weight gain was less,the liver coefficient ratio was significantly increased,the liver color was dark red,the liver sinusoids and central veins were congested,the hepatocytes were disordered,the nuclei were consolidated and contracted,and the arrangement was loose,the contents of ALT,AST,LDH,AKP,and ALB were significantly increased,and the mRNA and protein expressions of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6,and CYP2C9 were significantly reduced(all P＜0.05 or P＜0.01).CONCLUSION:The dose of Brucea javanica bitter alcohol is correlated with hepatotoxicity to nude mice.High doses of Brucea javanica bitter alcohol have hepatotoxicity to nude mice,which may be re-lated to reducing serum levels of ALT,AST,LDH,AKP,and ALB,inhibiting the expression of multiple subtypes of enzymes in the key enzyme CYP450 of liver drug metabolism,and then reducing the me-tabolism of toxic substances.

Objective Based on the"preventive treatment of disease"theory and real-world data,this study aimed to evaluate the clinical efficacy of Yangyin Shugan Formula in patients with ovarian dysfunction characterized by the syndrome of kidney deficiency and liver depression at different stages and to provide evidence for optimizing the timing of traditional Chinese medicine(TCM)in premature ovarian insufficiency(POI)management.Methods Ovarian dysfunction patients under 40 years old characterized by syndrome of kidney deficiency and liver depression,registered in the outpatient electronic medical records of the Second Affiliated Hospital of Guangzhou University of Chinese Medicine from January 2020 to December 2023,were stratified into three groups:subclinical POI,POI,and premature ovarian failure(POF)groups.The therapeutic outcomes of the three groups of patients were compared,including TCM syndrome total response rates,menstrual total response rates/normalization(cured)rates,base follicle-stimulating hormone(FSH)total response rate/normalization rates and anti-Müllerian hormone(AMH)levels.Results A total of 307 patients meeting the research criteria were included(97 cases in subclinical POI group,112 cases in POI group,and 98 cases in POF group).The TCM syndrome total response rates ranked as subclinical POI group(98.97%,96/97)>POI group(95.54%,107/112)>POF group(83.67%,82/98),with the POF group was lower than that of the subclinical POI and POI groups(P<0.017);while the difference of the subclinical POI group with the POI group was not significant.Menstrual total response rates ranked as subclinical POI group(97.22%,70/72)>POI group(72.32%,81/112)>POF group(51.02%,50/98),the differences among the three groups and in the post-hoc comparisons were significant(P<0.01,P<0.017);normalization rates ranked as subclinical POI group(90.28%,65/72)>POI group(54.46%,61/112)>POF group(26.53%,26/98),the differences among the three groups and in the post-hoc comparisons were significant(P<0.01,P<0.017).FSH total response rates ranked as subclinical POI group(89.69%,87/97)>POI group(81.25%,91/112)>POF group(60.20%,59/98),while POF group was lower than that of the other two groups(P<0.017),and the difference of the subclinical POI group with the POI group was not significant.Normalization FSH rates ranked as subclinical POI group(71.13%,69/97)>POI group(53.57%,60/112)>POF group(16.33%,16/98),the differences among the three groups and in the post-hoc comparisons were significant(P<0.01,P<0.017).Compared with before treatment,the FSH levels in all three groups decreased after treatment(P<0.01).The reduction of FSH in the POF and POI groups were better than that in the subclinical P OI group(P<0.017).No significant difference was observed in the reduction of FSH between the POI and POF groups.Post-treatment AMH elevation observed in the subclinical POI and POI groups(P<0.01).Conclusion Yangyin Shugan Formula improves the menstrual conditions and TCM syndromes across all the stages.It also improves elevated FSH levels across all the stages and has a specific effect on normalizing FSH and menstruation.Yangyin Shugan Formula increases the AMH levels of patients with subclinical POI and POI,highlighting the applicability of TCM in staged preventive management.

AIM:Hepatotoxicity of Brucea javani-ca picryl with broad-spectrum anticancer effect in nude mice based on hepatic drug metabolizing en-zyme CYP450 activity.METHODS:Fifty-six nude mice were randomly divided into blank group,Bru-cea javanica low-dose group(2 mg/kg),Brucea ja-vanica high-dose group(4 mg/kg),and cisplatin group(2 mg/kg),with 14 mice in each group.The blank group was injected with the same amount of normal saline every 3 days for 6 weeks.Calculate the mortality rate of nude mice in each group,ob-serve the general growth state of nude mice,re-cord the weight change of nude mice before and af-ter administration,weigh and record the liver weight after taking materials,and calculate the liv-er coefficient(liver weight/weight mass×100％),ob-serve and record the liver color and morphology.Hematoxylin-eosin(HE)staining was used to ob-serve the pathological changes of liver tissue.De-tection of alanine aminotransferase(ALT),aspar-tate aminotransferase(AST),lactate dehydrogenase(LDH),alkaline phosphatase(AKP)and albumin(ALB)levels in serum of nude mice by ELISA.Real-time PCR and Western blot were used to detect the mRNA and protein expression levels of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6 and CYP2C9,which were key enzymes of drug metabolism in nude mice liver.RESULTS:Compared with the blank group,the mortality rate of nude mice in the low-dose Brucea javanica bitter alcohol group was 0,the growth state was good,the diet,movement,and mental state were normal,the weight change and liver coefficient ratio were consistent,the liver color was ruddy,the liver lobule morphology was complete under the microscope,the structure was clear,the liver cells were arranged regularly,and there was no inflammatory cell infiltration.There was no significant difference in the content of ALT,AST,LDH,AKP,and ALB.There was no significant difference in the mRNA and protein expression of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6,and CYP2C9(all P＞0.05).Compared with the blank group,the mortality rate of nude mice in the high-dose group of Brucea javanica bitter alcohol was 14.3％,the growth state was slightly poor,the diet,movement,and mental state were reduced,the weight growth was slow,the liver coefficient ratio was increased,the liver color was reddish brown,some liver lobule boundaries were unclear,a small number of liver cells were loosely arranged,the contents of ALT,AST,LDH,AKP,and ALB were signif-icantly increased,the mRNA levels of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6,and CYP2C9 were significantly reduced,and the protein expres-sions of CYP2E1,CYP3A11,CYP1A2,and CYP2D6 were significantly reduced(all P＜0.05 or P＜0.01),but there was no statistical difference in the mRNA and protein expression of CYP2C19,and the pro-tein expression of CYP2C9(P＞0.05).Compared with the blank group,the mortality rate of nude mice in the cisplatin group was 35.7％,the growth state was poor,the diet,action,and mental state were low,the weight gain was less,the liver coefficient ratio was significantly increased,the liver color was dark red,the liver sinusoids and central veins were congested,the hepatocytes were disordered,the nuclei were consolidated and contracted,and the arrangement was loose,the contents of ALT,AST,LDH,AKP,and ALB were significantly increased,and the mRNA and protein expressions of CYP2E1,CYP3A11,CYP2C19,CYP1A2,CYP2D6,and CYP2C9 were significantly reduced(all P＜0.05 or P＜0.01).CONCLUSION:The dose of Brucea javanica bitter alcohol is correlated with hepatotoxicity to nude mice.High doses of Brucea javanica bitter alcohol have hepatotoxicity to nude mice,which may be re-lated to reducing serum levels of ALT,AST,LDH,AKP,and ALB,inhibiting the expression of multiple subtypes of enzymes in the key enzyme CYP450 of liver drug metabolism,and then reducing the me-tabolism of toxic substances.

Objective:To investigate the risk factors and construct a nomogram prediction model for neonatal bacterial meningitis (BM).Methods:A retrospective cohort study was conducted on 1 228 neonates who underwent lumbar puncture for cerebrospinal fluid examination in the Department of Neonatology at Gansu Provincial Women and Child Healthcare Hospital from December 2019 to February 2024. The subjects were randomly divided into a training cohort and a validation cohort at a ratio of 7∶3 using a computer program. Rank sum test or Chi-square tests were used to compare differences between the two cohorts. The subjects were divided into BM and non-BM groups based on the presence or absence of BM. Multivariate logistic regression analysis (forward stepwise regression method) was used in the training cohort to identify risk factors for BM. The area under the receiver operating characteristic curve (AUC) and the Hosmer-Lemeshow goodness-of-fit test were used to assess the discrimination and calibration of the model, respectively. Calibration curves were used to evaluate the accuracy of the model and to construct the nomogram. Internal validation was performed using the Bootstrap resampling method. Decision curve analysis was used to assess the clinical utility of the model. Results:Among the 1 228 neonates, 151 (12.3%) had BM. The training cohort included 859 neonates, of whom 106 (12.3%) had BM and 753 (87.7%) did not. The validation cohort included 369 neonates, of whom 45 (12.2%) had BM and 324 (87.8%) did not. The results of the multivariate logistic regression analysis in the training cohort showed that sepsis ( OR=4.446, 95% CI:2.583-7.653), convulsions ( OR=3.749, 95% CI:1.930-7.280), high maximum body temperature ( OR=2.027, 95% CI:1.636-2.513), and elevated C-reactive protein ( OR=1.007, 95% CI:1.003-1.012) were independent risk factors for BM, while greater gestational age at birth ( OR=0.946, 95% CI: 0.898-0.995) and higher hemoglobin levels ( OR=0.990, 95% CI:0.981-0.998) were protective factors for BM (all P<0.05). Based on these findings, a nomogram prediction model for neonatal BM was constructed and validated for accuracy. The AUC values of the nomogram model in the training and validation cohorts were 0.796 (95% CI: 0.750-0.843) and 0.781 (95% CI: 0.700-0.862), respectively. The Hosmer-Lemeshow goodness-of-fit test showed P>0.05 in both cohorts. The clinical decision curve analysis demonstrated good net benefit across most threshold ranges. Conclusions:Sepsis, convulsions, high maximum body temperature, and elevated C-reactive protein increase the risk of neonatal BM. The nomogram model constructed based on these factors, combined with gestational age and hemoglobin levels, provides a reference value for predicting the risk of neonatal BM.

Objective:To analyze the accuracy of nine estimation methods for umbilical venous catheterization (UVC) insertion depth in neonates.Methods:This prospective study enrolled neonates who underwent successful UVC placement in the Department of Neonatology at Gansu Provincial Women and Child Healthcare Hospital between September 2023 and October 2024. The standard catheter tip position was defined as the junction of the inferior vena cava and right atrium, with a deviation of ≤0.5 cm considered accurate. Patients were stratified by birth weight (BW) into three groups: <1 500 g, 1 500- 2 499 g, and ≥2 500 g. The actual UVC depth was compared with depths estimated using nine methods: Shukla formula, modified Shukla formula, JSS formula, BW formula, Tambasco formula, modified Tambasco formula, Dunn's nomogram, body surface measurement, and ultrasonographic measurement. Accuracy was evaluated using nonparametric tests and Bland-Altman agreement analysis.Results:The study included 111 neonates: 41 (36.9%) in the <1 500 g group, 55 (49.6%) in the 1 500-2 499 g group, and 15 (13.5%) in the ≥2 500 g group. In the <1 500 g group, accuracy rates ranged from 24% to 56%, with body surface measurement showing the highest accuracy (56%); the mean difference from actual depth was－0.073 cm, with 95% limits of agreement (LOA) of－1.764 to 1.618 cm. In the 1 500-2 499 g group, accuracy rate ranged from 15% to 51%, with the modified Tambasco formula being most accurate (51%); the mean difference was 0.113 cm (95%LOA:－1.558-1.783 cm). In the ≥2 500 g group, accuracy rate ranged from 0/15 to 10/15, with Dunn's nomogram being most accurate (10/15); the mean difference was－0.120 cm (95%LOA:－1.380-1.140 cm).Conclusions:The accuracy of the nine UVC depth estimation methods varied across different BW groups and among methods within the same group. Selection of an estimation method should be tailored to the neonate's birth weight.