Background SF-6Dv2, the latest version of SF-6D, has been developed recently, and its measurement properties remain to be evaluated and compared with the EQ-5D-5L. The aim of this study was to assess and compare the measurement properties of the SF-6Dv2 and the EQ-5D-5L in a large-sample health survey among the Chinese population. Methods Data were obtained from the 2020 Health Service Survey in Tianjin, China. Respondents were randomly selected and invited to complete both the EQ-5D-5L and SF-6Dv2 through face-to-face interviews or self-administration. Health utility values were calculated by the Chinese value sets for the two measures. Ceiling and floor effects were firstly evaluated. Convergent validity and discriminate validity were examined using Spearman’s rank correlation and effect sizes, respectively. The agreement was assessed using intraclass correlation coefficients (ICC). Sensitivity was compared using relative efficiency and receiver operating characteristic. Results Among 19,177 respondents (49.3% male, mean age 55.2 years, ranged 18–102 years) included in this study, the mean utility was 0.939 (0.168) for EQ-5D-5L and 0.872 (0.184) for SF-6Dv2. A higher ceiling effect was observed in EQ-5D-5L than in SF-6Dv2 (72.8% vs. 36.1%). The Spearman’s rank correlation (range: 0.30–0.69) indicated an acceptable convergent validity between the dimensions of EQ-5D-5L and SF-6Dv2. The SF-6Dv2 showed slightly better discriminative capacities than the EQ-5D-5L (ES: 0.126–2.675 vs. 0.061–2.256). The ICC between the EQ-5D-5L and SF-6Dv2 utility values of the total sample was 0.780 (p < 0.05). The SF-6Dv2 had 29.0–179.2% higher efficiency than the EQ-5D-5L at distinguishing between respondents with different external health indicators, while the EQ-5D-5L was found to be 8.2% more efficient at detecting differences in self-reported health status than the SF-6Dv2. Conclusions Both the SF-6Dv2 and EQ-5D-5L have been demonstrated to be comparably valid and sensitive when used in Chinese population health surveys. The two measures may not be interchangeable given the moderate ICC and the systematic difference in utility values between the SF-6Dv2 and EQ-5D-5L. Further research is warranted to compare the test–retest reliability and responsiveness.

Background Quality of life (QoL) is one of the most important indicators for evaluating an individual’s overall health status. However, evidence exploring the trend in QoL of the Chinese population is still lacking. This study aimed to investigate the trend in QoL of the Chinese population measured by the EQ-5D from 2008 to 2020, as well as compare the changing trends in QoL categorized by populations with different socio-demographic characteristics. Methods Data were obtained from the 2008, 2013, and 2020 waves of the Health Services Surveys conducted in Tianjin, China. Respondents completed the EQ-5D (EQ-5D-3L in 2008 and 2013 and EQ-5D-5L in 2020) through face-to-face interviews or self-administration. Responses of the EQ-5D-3L in 2008 and 2013 were mapped onto the EQ-5D-5L responses, and then converted to utility values using the Chinese value set. The trend in QoL was explored by comparing the percentage of any reported problems on each EQ-5D dimension and the corresponding utility values across the three waves. Subgroup analyses were performed to compare trends in utility values stratified by socio-demographic indicators. The effect of the time variable (year) on utility values was assessed by multiple linear regression analyses using the pooled data. Results By analyzing and comparing the three waves of the data (N = 25,939 in the 2008 wave, N = 22,138 in 2013, and N = 19,177 in 2020), an upward trend was observed in the percentages of reporting problems on all five dimensions (p < 0.001), resulting in a decreasing trend in utility values (2008: 0.948, 2013: 0.942, 2020: 0.939, p < 0.001). Utility values declined more over time among the female, the elder, the recipients of medical assistance, the widowed, the unemployed, and respondents with primary or lower education. The effect of the year (Coef. for 2013 = − 0.009, p < 0.001; Coef. for 2020 = − 0.010, p < 0.001) confirmed the downward trend in the utility values. Conclusions The overall QoL of the Chinese population decreased over the period from 2008 to 2020. The QoL of the disadvantaged or vulnerable populations in terms of socioeconomic characteristics declined more over time.

environmental education in protected areas. Presently, the development of interpretation systems is limited due to a lack of research of the spatiotemporal patterns of interpretation resources in China's protected areas, and the lack of corresponding field investigation methods. As a result, the interpretation system does not meet the needs of the public's understanding of nature and fails in fulfilling environmental education objectives. Therefore, we aimed to study the spatiotemporal patterns of interpretation resources of Reed Lake in the Jiuzhaigou National Nature Reserve. Methods: We summarized six selection criteria of interpretation resources, as well as investigated and monitored the regional interpretation resources in the Reed Lake interpretation trail in Jiuzhaigou. Based on the attributes, meanings, and distribution characteristics of interpretation resources, interpretation themes were designed using the thematic interpretation method. Results: We found 195 interpretation resource types, including: 100 types of plants and fungi, 62 types of animals, 5 ecosystem types, 7 types of geology and hydrology, 2 types of astronomical phenomena and climate, and 19 types of cultural resources. Spatially, plant, fungus, animal, and ecosystem resources were mainly distributed in the inner part of the trail. The cultural interpretation resources were more distributed in the outer part of the trail. In time, the number of interpretation resources was highest in summer and autumn, and less in winter and spring. Furthermore, the number of animal, plant, and fungus interpretation resources had obvious seasonality. Eight interpretation themes were designed to provide references of interpretation content for the organization. Conclusion: Exploring meanings inherent in interpretation resources and understanding their distributions are critical for delivering the uniqueness and importance of the resources to the public, and thus should be incorporated into the planning of interpretation systems. This study provides a methodological reference for the investigation of interpretation resources and system construction of environmental interpretation in China's nature reserve system.