Variable assignment and selection.

Aim
To explore the different types of social network types and their impact on the health of the elderly, as well as the influencing mechanisms to promote their health.
Method
k-means clustering, regression analysis, mediating effect method.
Results
For Chinese elderly people, social network types have a significant impact on the self-rated health, but not on the chronic conditions. The benefits of diverse social network types are significant and positively influence their health by enhancing psychological resilience. There is heterogeneity among different characteristic groups.
Discussion
This not only suggests that elderly individuals should consciously engage with different types of people in their daily lives, but also emphasizes the need for the government to further establish and improve platforms that promote a diverse social network for the elderly, and provide personalized services and guidance for different groups.

研究目的：探索不同类型的社交网络及其对老年人健康的影响，以及促进老年人健康的作用机制。
研究方法：采用k-means聚类（k-means clustering）、回归分析与中介效应分析法。
研究结果：针对中国老年群体，社交网络类型对其自评健康具有显著影响，但对慢性疾病状况无显著作用。多样化社交网络类型的健康效益显著，可通过提升心理韧性对老年人健康产生正向影响。不同特征群体间存在异质性。
讨论：本研究结果提示，老年人在日常生活中应主动与不同类型人群建立社交联结；同时，政府需进一步建立并完善面向老年人的多样化社交网络促进平台，并为不同群体提供个性化服务与指导。