吴士艳, 张旭熙, 孙凯歌, 胡康, 刘思佳, 孙昕霙. 慢性病高危人群和健康人群休闲类身体活动健康信念模式的多组结构方程模型分析. 北京大学学报(医学版), 2018,50(4): 711-716.
WU Shi-yan, ZHANG Xu-xi, SUN Kai-ge, HU Kang, LIU Si-jia, SUN Xin-ying. Application of multi-group structural equation model in comparative study of HBM related to recreational physical activity among population with high risk of chronic diseases and healthy people. Journal of Peking University(Health Sciences), 2018,50(4): 711-716.
Application of multi-group structural equation model in comparative study of HBM related to recreational physical activity among population with high risk of chronic diseases and healthy people
WU Shi-yan1, ZHANG Xu-xi1, SUN Kai-ge1, HU Kang1, LIU Si-jia2,△, SUN Xin-ying1,△
1. Department of Social Medicine and Health Education, School of Public Health, Peking University, Beijing 100191, China
2.Tongzhou Center for Disease Prevention and Control, Beijing 101100, China
Objective: To explore mechanism of health beliefs by application of health belief model (HBM) and structural equation modeling (SEM) with regard to recreational physical activity (PA), to identify the differences of among population with high risk of chronic diseases and healthy people, and to provide the specific interventions of recreational physical activity and reference for health relevant policy-making in the future.Methods: A total of 2 736 residents with high risk of chronic diseases and 1 514 healthy people were involved. A questionnaire survey, physical examination and biochemical examination were conducted. The questionnaire based on HBM had acceptable validity and reliability. The proposed model based on the total sample size of the two groups was developed using the structural equation model-ing and multi-comparison in the ways of appearance and parameters were also validated.Results: The median amount of recreational (PA) among population with high risk of chronic diseases and healthy people were 0.0 thousand-step equivalent with quartile of (0.0, 4.6) and 0.0 thousand-step equivalent with quartile of (0.0, 4.0) respectively. The results of SEM suggested that the direct effects of perceived objective barriers(β=-0.245), perceived subjective barriers(β=-0.057), cues to action(β=-0.043) and self-efficacy(β=0.117) on recreational (PA) were significant. Self-efficacy was the most important mediator. The multi-group comparisons indicated that the models of the two groups had the same appearance but the parameters between them were significant (Δ χ2= 27.4, P<0.05). The multi-group structural equation model (MSEM) indicated that two paths from cues to action and from perceived subjective barriers to recreational (PA) were not statistically significant among the population with high-risk of chronic diseases. In the two groups, one path coefficient from perceived objective barriers to subjective barriers ( P=0.007) was statistically significant ( P<0.05).Conclusion: The recreational (PA) levels of both groups were lower. Health beliefs on recreational (PA) of the two groups played different roles and some paths were also different. Therefore, specific interventions and strategies should be developed for different people. For residents with high risk of chronic diseases, much more attention should be paid to reduce the objective and subjective barriers of recreational physical activity and to improve self-efficacy so as to delay or prevent the occurrence of chronic diseases and then to improve the quality of life of this kind of population.
Key words:
Recreational physical activity; Health belief model; Multi-group structural equation mo-deling; High risk population; Healthy people
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Recent cutoff criteria for goodness of fit indices in structural equation analysis proposed by Hu and Bentler (1998, 1999) were discussed. After reviewing their recommended 7 indexes, we demonstrated the inappropriateness of their single index or 2-index combinational rules. Subsequently we proposed that a new rule based on Chi-square test at a certain extremely low significant level was more useful for their purposes. Comparing with Hu and Bentler's rules, we showed that our proposed rule is better and more appropriate. Finally, we discussed guidelines on ways to evaluate a fitted model or to compare alternative models.
(1 Faculty of Education, The Chinese University of Hong Kong, Hong Kong, China) (2 Faculty of Education, South China Normal University, Guangzhou, 510631, China) (3 Faculty of Education, University of Western Sydney, Australia, NSW2560)