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Chronic disease, mental health symptoms and poor social relations are reported common causes for poor self-rated health in older people. To assess the co-occurrence rate of chronic diseases, poor mental health and poor social relationships in older people, and determine their association with self-rated health. 6,551 older people in Zhongshan, China, participated a large health surveillance program were randomly selected and questioned about their SRH, chronic conditions, mental health symptoms and social relationships. The association between self-rated health and chronic conditions, poor mental health, social relationships, and their co-occurrence were analyzed. 56.4% of participants reported poor self-rated health. 39.1% experienced at least one chronic disease. 29.0% experienced one or more mental health symptoms; 19.5% experienced at least one poor social relationship. 7.8% had co-occurrence of chronic diseases, mental health problems, and poor social relationships. Logistic regressions showed that poor self-rated health was associated with chronic diseases, poor mental health, poor social relationships and their co-occurrence. The findings indicate the importance of managing chronic disease, poor mental health and poor social relationships for older people.

A novel tri-band frequency selective surface (FSS) is proposed by using multi-layer printed circuit boards with a number of via holes. Three separate propagation paths with two stepped-impedance resonators (SIRs) and a uniform-impedance resonator (UIR) are constructed in each unit cell of the proposed FSS, thus leading to tri-band bandpass performance. The lowest and the middle frequency bands are achieved by two SIRs, respectively, and the highest frequency band is obtained by the resonance of the UIR. Therefore, these three passbands can be realised independently, which can increase the design freedom. The operating principle is explained by analysing the electric field distributions. To verify the design concept, a prototype of the proposed FSS is simulated and tested. Measured results show that the FSS features stable tri-band performance under a large variation of incident angle.