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Innoculation of pneumococcal vaccines among the elderly is an effective public health policy to prevent pneumococcal diseases and it is widely promoted by many developed countries. The pneumococcal vaccination rate among the elderly in China was only 3.7% in 2019, it grew rapidly during the early stage of the COVID-19 pandemic. The purpose of this cross-sectional study was to investigate the psychological and demographic-economic factors related to the uptake behavior of pneumococcal vaccination among the Chinese elderly by using an integrated model based on the unified theory of acceptance and use of technology (UTAUT), and knowledge, attitudes and practices (KAP). The theoretical model was tested via structural equation modeling (SEM) with data collected from 516 Chinese older adults aged 60 years and older. Our results suggested that knowledge, performance expectancy, effort expectancy, attitude, and trust had a significant correlation with behavioral intention; behavioral intention and trust had a positive correlation with the uptake behavior, gender, and and education level and chronic obstructive pulmonary disease exerted significant moderating effects. To increase the coverage of pneumococcal vaccination among the elderly, it is necessary to provide effective health education by authoritative experts, thereby enhancing their knowledge and positive attitude towardthe vaccination. [ABSTRACT FROM AUTHOR]

• Ease of use and usefulness influence use intention of weight management applications. • Perceived risk is the significant negative determinant behavioral intention. • Weight management behavior is effectively analyzed by technology acceptance model. • Market strategy of weight management apps should be based on demographics. During the COVID-19 epidemic, the number of obesities increased rapidly in China. Weight management apps have potential value in controlling obesity. Explore the mechanisms behind the adoption of weight management applications by overweight and obese individuals, including psychological factors and demographic variables. The theoretical model was extended from the technology acceptance model (TAM), and the structural equation model was used for hypothesis testing. From January 2020 to December 2021, we conducted a cross-sectional survey in six megacities in mainland China during the COVID-19 pandemic by an online questionnaire. 1364 participants completed the questionnaire, and the proposed theoretical model explained 55.7% of the variance in behavioral intention. Perceived usefulness was predicted by perceived ease of use (β = 0. 290), attitude was jointly predicted by perceived usefulness (β = 0.118) and perceived ease of use (β = 0.159). Behavioral intention was predicted by perceived usefulness (β = 0. 256), perceived ease of use (β = 0. 463), attitude (β = 0. 293), and perceived risk (β = −0.136). Health awareness (β=0.016) did not significantly affect behavioral intention. Four demographic variables gender, age, education, and residence exerted significant moderating effects in theoretical model. During the COVID-19 epidemic, the health awareness and behavior patterns of obese people have changed significantly. Psychological factors and demographic characteristics dynamically interact to generate user behavioral intentions of weight management applications. Weight management application developers and marketers should focus on perceived usefulness, safety, ease of use, and health awareness. [ABSTRACT FROM AUTHOR]

Competing Interests: Conflict of Interests The authors declare that there is no conflict of interests.