Three problems about the concept of validity were discussed here,which is the evolution of concept of validity and its existing problems,a new understanding of validity and how to construct validity.During the development of the concept of validity,content validity,predictive validity,construct validity as well as concurrent validity were prevailing until the emergence of construct validity in which all aspects of validity were involved.To date,the bias we put on the concept of validity were mainly originated from the way by which we have taken concept of validity as a nomological network.Actually,the concept of validity is a ontological claim which is seriously based on reference and causality.We should establish a theory hypothesis,form a test,and confirm the measure attribute,so we could obtain the validity.

ve To increase the analytical efficacy and the sensitivity of determination of trace chloroform and tetrachloro-methane in water. Methods Headspace solid phase microextraction (HSSPME) analysis was applied to replace the traditional headspace method in determination of trace chloroform and tetrachloro-methane in water. Results The lowest detection limits were 0.05?g/L for chloroform and 0.005?g/L for tetrachloro-methane respec-tively. The precisions and accuracies all accorded with the requirements of determination. Conclusion The method of HSSPME was easy and rapid to operate, revealed reliable and accurate results and good practicability. It also showed higher sensitivity without any organic solvent, compared with that of traditional headspace method.

Objective:To explore the relationship between social support,well-being source and subjective well-being of city teachers.Methods:168 city teachers were measured by questionnaires of "Teacher's Well-being Source Scale" "Index of General Affect" "Life Satisfaction Scale" and "Teacher's Social Support Scale".Results:①Teacher's well-being source could predict teacher's subjective well-being.②Teacher's well-being source was a mediator factor between social support and subjective well-being.Conclusion:The social support from direct leader affect the subjective well-being with well-being source.

Leptospirosis is recognized as an important emerging zoonotic disease caused by pathogenic Leptospira spp.and has a serious impact on people′s health and animal husbandry.Therefore, it has attracted more and more attention.With the development of biotechnology, major breakthroughs have been made in the fields of pathogenicity, molecular epidemic features and evolution mechanism of Leptospira.In this review, we summarize progress in evolution and molecular typing of Leptospira at home and abroad in order to provide a reference for further research on molecular epidemiological surveillance and new vaccine development.

Objective To investigate the surgical selection of retinal detachment with myopic macular holes. Methods Management strategies were adopted according to the ocular symptoms of patients with high myopia involved in posterior chorioretinal atrophy, the colour showed by the bottom of macular holes and the shape of posterior staphyloma. Seventy-five eyes of 72 patients fulfilled the study criteria. The patients were followed up in an average of eight-month-observation and were divided into three groups: single 16% C2F6 gas tamponade (26 eyes of 26 patients) as group A,vitrectomy combined with 16% C2F6 gas tamponade (26 eyes of 23 patients) as group B and vitrectomy with silicon oil tamponade (23 eyes of 23 patients) as group C. Results 69.2%(18/26) of the macular holes were closed in group A, 73.1%(19/26)in group B and 87.0% (20/23) in group C after the primary surgery. Comparison of postoperative outcomes,macular hole closure rate was not significantly different among three groups (P= 0.3184). Conclusions It suggests that good anatomic retinal reattachment be achieved using any approach. However, the optimal surgical choice regarding of the personality case offered less surgical burden and more rapid visual rehabilitation to patients.

Objective: To discuss the clinical significance of antibacterial peptide LL-37 in the early diagnosis of patients with sepsis in emergency department. Methods: Forty patients diagnosed with sepsis in the emergency department of the Affiliated Hospital of Zunyi Medical College from December 2017 to March 2018 were enrolled as sepsis group. Twenty healthy volunteers were enrolled contemporaneously in our hospital at medical center as healthy control group. Peripheral blood was collected immediately after diagnosis in sepsis group or during physical examination in healthy control group. The expression of antibacterial peptide LL-37 was determined by enzyme-linked immunosorbent assay (ELISA). Meanwhile, serum procalcitonin (PCT) and C-reactive protein (CRP) levels were determined. The differences in antibacterial peptide LL-37, PCT and CRP levels between the two groups were compared. Pearson correlation method was used to analyze the correlation between antibacterial peptide LL-37, PCT and CRP. Receiver operating characteristic (ROC) curve was drawn, and the early individually or jointly diagnostic value of each detected index for sepsis was analyzed. Results: The levels of antimicrobial peptide LL-37, PCT and CRP in peripheral blood of sepsis group were significantly higher than those of healthy control group [LL-37 (μg/L): 1.34±0.69 vs. 0.10±0.06, PCT (μg/L): 46.67±39.51 vs. 0.03±0.02, CRP (mg/L): 129.68±49.83 vs. 3.16±2.85], with statistically significant differences (all P < 0.05). Pearson correlation analysis showed that the expression of antimicrobial peptide LL-37 was positively correlated with PCT and CRP levels (r₁ = 0.835, r₂ = 0.932, both P < 0.01). ROC curve analysis showed that the area under ROC curve (AUC) of LL-37, PCT and CRP for early diagnosis of sepsis was 0.885, 0.963 and 0.983, respectively, and the AUC of combined diagnosis of the three parameters was as high as 0.994, indicating that the value of combined diagnosis of sepsis was greater than that of single diagnosis; when the combined prediction probability of the three parameters was 0.92, the sensitivity was 97.5%, and the specificity was 95.0%. Conclusion Antibacterial peptide LL-37 has certain clinical value in early diagnosis of patients with sepsis, which can be used as early routine monitoring indicators for patients with early sepsis when combined with PCT and CRP.

OBJECTIVE: To discuss the clinical significance of antibacterial peptide LL-37 in the early diagnosis of patients with sepsis in emergency department. METHODS: Forty patients diagnosed with sepsis in the emergency department of the Affiliated Hospital of Zunyi Medical College from December 2017 to March 2018 were enrolled as sepsis group. Twenty healthy volunteers were enrolled contemporaneously in our hospital at medical center as healthy control group. Peripheral blood was collected immediately after diagnosis in sepsis group or during physical examination in healthy control group. The expression of antibacterial peptide LL-37 was determined by enzyme-linked immunosorbent assay (ELISA). Meanwhile, serum procalcitonin (PCT) and C-reactive protein (CRP) levels were determined. The differences in antibacterial peptide LL-37, PCT and CRP levels between the two groups were compared. Pearson correlation method was used to analyze the correlation between antibacterial peptide LL-37, PCT and CRP. Receiver operating characteristic (ROC) curve was drawn, and the early individually or jointly diagnostic value of each detected index for sepsis was analyzed. RESULTS: The levels of antimicrobial peptide LL-37, PCT and CRP in peripheral blood of sepsis group were significantly higher than those of healthy control group [LL-37 (μg/L): 1.34±0.69 vs. 0.10±0.06, PCT (μg/L): 46.67±39.51 vs. 0.03±0.02, CRP (mg/L): 129.68±49.83 vs. 3.16±2.85], with statistically significant differences (all P < 0.05). Pearson correlation analysis showed that the expression of antimicrobial peptide LL-37 was positively correlated with PCT and CRP levels (r₁ = 0.835, r₂ = 0.932, both P < 0.01). ROC curve analysis showed that the area under ROC curve (AUC) of LL-37, PCT and CRP for early diagnosis of sepsis was 0.885, 0.963 and 0.983, respectively, and the AUC of combined diagnosis of the three parameters was as high as 0.994, indicating that the value of combined diagnosis of sepsis was greater than that of single diagnosis; when the combined prediction probability of the three parameters was 0.92, the sensitivity was 97.5%, and the specificity was 95.0%. CONCLUSIONS Antibacterial peptide LL-37 has certain clinical value in early diagnosis of patients with sepsis, which can be used as early routine monitoring indicators for patients with early sepsis when combined with PCT and CRP.
Antimicrobial Cationic Peptides/metabolism* ; C-Reactive Protein ; Calcitonin ; Calcitonin Gene-Related Peptide ; Early Diagnosis ; Emergency Service, Hospital ; Humans ; Protein Precursors ; ROC Curve ; Sepsis/metabolism* ; Cathelicidins

Objective:To construct a humanistic care intervention program for stroke patients after discharge and evaluate the implementation effect.Methods:Through preliminary research, literature review and expert consultation, the humanistic care program for stroke patients after discharge based on Watson's humanistic care theory was constructed and integrated into clinical practice intervention program and implemented. By convenience sampling method, stroke patients discharged from the Neurology Department of Shanghai Pudong New Area People's Hospital in June 2019 were selected as the control group, and patients discharged in July 2019 were selected as the intervention group. The control group received routine follow-up, and the intervention group received humanistic care intervention program after discharge. The scores of the WHO Quality of Life-BREF (WHOQOL-BREF) , limb function improvement, and the General Well-Being Schedule were compared between the two groups before and after the intervention.Results:After the intervention, the WHOQOL-BREF total score of the intervention group was (55.74±4.88) , and the total score of the General Well-Being Schedule was (72.06±8.02) , which was higher than (48.49±5.77) , (65.09±3.45) of the control group. The differences were statistically significant ( P<0.05) . After the intervention, the limb function improvement score of the intervention group was (3.52±0.71) , which was not significantly different from that in the control group (3.20±0.63) . Conclusions:Through the construction and application of humanistic care program for stroke patients after discharge, it can effectively improve the quality of life, and happiness of COPD patients.

Objective:To investigate the psychological status of HD nursing staff in hospitals in Guangdong province and its influential factors.Methods:1 630 nursing staff in HD rooms of 71 hospitals or units in Guangdong Province in February and March 2020 were evaluated by using the 10-item Kessler psychological distress scale (Kessler 10), General self-efficacy scale (GSES) and Connor-Davidson resilience scale (CD-RISC) to conduct a questionnaire survey on their psychological status. Insomnia severity index (ISI) and Fatigue scale-14 (FS-14) were used to investigate their degree of insomnia and fatigue. General information on gender, age, educational level, marital status, economic income, professional title, HD working hours, average weekly overtime times and hours, total number of HD patients per day, and whether holding other positions were collected.Results:A total of 1 630 questionnaires were collected, among which 1 629 were valid, with an effective recovery rate of 99.9%. The scores of the three scales were (20.16±7.47), (27.03±4.45) and (58.37±15.75), respectively. According to the Kessler 10, 835 people (51.2%) had mental disorders. Univariate analysis showed that age, educational level, economic income, type of work unit, total number of HD patients per day and living status in recent one week were related with Kessler 10 score (all P<0.05). Economic income, type of work unit, whether holding other positions, total number of HD patients per day and living status in recent one week were related with GSES scores (all P<0.05). Age, marital status, economic income, professional title, type of work unit, whether holding other positions and living status in recent one week were related to CD-RISC score (all P<0.05). Spearman rank correlation analysis showed that the number of HD machines ( r=0.100, P<0.001), the number of nurses ( r=0.082, P=0.001), average weekly overtime times ( r=0.142, P<0.001) and overtime hours ( r=0.136, P<0.001), ISI score ( r=0.572, P<0.001) and FS-14 score ( r=0.635, P<0.001) were correlated with Kessler 10 score. ISI score ( r=-0.311, P<0.001) and FS-14 score ( r=-0.335, P<0.001) were correlated with GSES score. Working years of HD service ( r=0.112, P<0.001), ISI score ( r=-0.289, P<0.001) and FS-14 score ( r=-0.314, P<0.001) were correlated with CD-RISC score. Multiple linear regression analysis showed that the economic income in 5 001-10 000 yuan (with<3 000 yuan as reference, B=-1.603, 95% CI -3.036--0.169, P=0.028) and the total number of HD patients per day >200 (with ≤50 as reference, B=-1.153, 95% CI -2.242--0.065, P=0.038) were negatively correlated with Kessler 10 score, and average weekly overtime times ( B=0.221, 95% CI 0.069-0.374, P=0.004), ISI score ( B=0.518, 95% CI 0.454-0.582, P<0.001) and FS-14 score ( B=1.166, 95% CI 1.066-1.265, P<0.001) were positively correlated with Kessler 10 score. The economic income (with<3 000 yuan as reference) in 3 001-5 000 yuan ( B=1.930, 95% CI 0.847-3.013, P<0.001), 5 001-10 000 yuan ( B=1.949, 95% CI 0.887-3.012, P<0.001), 10 001-15 000 yuan ( B=1.482, 95% CI 0.318-2.647, P=0.013), >20 000 yuan ( B=4.300, 95% CI 2.463-6.136, P<0.001), secondary hospital (with primary hospitals as reference, B= 1.078, 95% CI 0.005-2.152, P=0.049) and holding other positions ( B=0.729, 95% CI 0.277-1.181, P=0.002) were positively correlated with GSES score, and ISI score ( B=-0.169, 95% CI -0.217--0.120, P<0.001) and FS-14 score ( B=-0.403, 95% CI -0.478--0.328, P<0.001) were negatively correlated with GSES score. The economic income (with<3 000 yuan as reference) in 3 001-5 000 yuan ( B=7.631, 95% CI 3.753-11.509, P<0.001), 5 001-10 000 yuan ( B=9.236, 95% CI 5.362-13.110, P<0.001), 10 001-15 000 yuan ( B=9.039, 95% CI 4.735-13.342, P<0.001), 15 001-20 000 yuan ( B=8.639, 95% CI 2.989-14.289, P=0.003), >20 000 yuan ( B=16.101, 95% CI 9.162-23.039, P<0.001) and holding other positions ( B=3.228, 95% CI 1.510-4.945, P<0.001) were positively correlated with CD-RISC score, and ISI score ( B=-0.593, 95% CI -0.765--0.420, P<0.001) and FS-14 score ( B=-1.258, 95% CI -1.525--0.992, P<0.001) were negatively correlated with CD-RISC score. Conclusion:The psychological status of nursing staff in HD rooms of hospitals in Guangdong Province needs to be improved. Effective preventive measures should be taken to provide timely psychological support, counseling and intervention to nursing staff with psychological abnormalities, and encourage them to take the initiative to seek psychological counseling when necessary, so as to promote their physical and mental health.

Objective    To evaluate the data of preoperative aortic root CT angiography (CTA), compare it with two-dimensional transthoracic echocardiography and investigate the correlation of the two measurements with the actual intraoperative measurement data. Methods    Clinical data of 53 patients with aortic valve diseases who underwent aortic valve repair in our hospital from January 2018 to August 2020 were retrospectively analyzed, including 38 males and 15 females with an average age of 42.9±18.3 years ranging from 10 to 77 years. Preoperative two-dimensional transthoracic echocardiography (TTE) and aortic root CTA measurements were collected, including aortic valve annulus (AVA), aortic sinus (Sinus) and sino-tubular junction (STJ). In comparison with the intraoperative measurements during the aortic valve repair surgery, the consistency analysis was performed. Results    Both the preoperative echocardiography AVA measurements and the CT AVA measurements were positively correlated with the intraoperative AVA measurements (P<0.001). Compared with the echocardiography AVA data [correlation coefficient (ρ)=0.74, mean squared error (MSE)=12.78], the CT AVA data were more accurate and consistent with the intraoperative AVA measurements (ρ=0.95, MSE=2.72). CT AVA data had a higher correlation coefficient with the intraoperative measurements, compared to that of  the echocardiography AVA data (P<0.001). Conclusion    In comparison with two-dimensional transthoracic echocardiography, preoperative morphological evaluation of aortic root CTA is more consistent with the actual intraoperative measurements during aortic valve repair surgery.