Impact of the Changes in the Frequency of Social Participation on All-Cause Mortality in Japanese Older Adults: A Nationwide Longitudinal Study

Association of increased participation in social activity in later life with risk of all-cause mortality and heart diseases in older people: results from the Chinese Longitudinal Healthy Longevity Survey (CLHLS)

Background

Previous studies have shown social activity is associated with reduced risk of health outcomes. However, among older people (≥65 years) who were socially inactive at baseline, limited study explored whether increased participation in social activity in later life was associated with reduced risk of health outcomes; therefore, using the data from the Chinese Longitudinal Healthy Longevity Survey, the study was performed.

Methods

The study outcomes were 10-year all-cause mortality (sample number = 9,984) and 10-year heart diseases (sample number = 7,496). The exposure was the change of social activity frequency. Cox regression analysis was used for data analysis.

Results

During the follow-up, there were 6,407 all-cause mortalities and 1,035 heart diseases, respectively. Kaplan-Meier analysis demonstrated that cumulative incidences of all-cause mortality were significantly lower in participants with changes into more frequent social activity (log-rank p < 0.001), while no significant difference was observed for heart diseases (log-rank p = 0.330). Compared with the subgroup who never participated in social activity at baseline, adjusted HRs of all-cause mortality were 0.79 (95% CI: 0.70-0.90, p < 0.001), 0.78 (95% CI: 0.63-0.96, p = 0.019), 0.74 (0.59-0.92, p = 0.006), and 0.70 (95% CI: 0.56-0.88, p = 0.002) for the subgroup of switching to sometimes, the subgroup of switching to once a month, the subgroup of switching to once a week, and the subgroup of switching to everyday, respectively. The corresponding HRs of heart diseases were 0.83 (95% CI: 0.65-1.08, p = 0.170), 0.82 (95% CI: 0.51-1.31, p = 0.412), 0.91 (0.58-1.42, p = 0.675) and 0.75 (95% CI: 0.47-1.20, p = 0.227), respectively. Stratified and sensitivity analyses revealed similar results.

Conclusion

Among older people who never participated in social activity, increased participation in social activity in later life was associated with reduced risk of all-cause mortality, but was not associated with reduced risk of heart diseases.

Association between social activity frequency and overall survival in older people: results from the Chinese Longitudinal Healthy Longevity Survey (CLHLS)

BACKGROUND

This study aimed to explore the impact of social activity frequency on mid- and long-term overall survival in older Chinese people.

METHODS

The association between social activity frequency and overall survival was analysed in 28 563 subjects from the Chinese Longitudinal Healthy Longevity Survey (CLHLS) cohorts.

RESULTS

A total of 21 161 (74.1%) subjects died during the follow-up of 132 558.6 person-years. Overall, more frequent social activity was associated with longer overall survival. From baseline to 5 years of follow-up, adjusted time ratios (TRs) for overall survival were 1.42 (95% CI 1.21 to 1.66, p<0.001) in the not monthly but sometimes group, 1.48 (95% CI 1.18 to 1.84, p=0.001) in the not weekly but at least once/month group, 2.10 (95% CI 1.63 to 2.69, p<0.001) in the not daily but at least once/week group, and 1.87 (95% CI 1.44 to 2.42, p<0.001) in the almost everyday group versus never group. From 5 years to the end of follow-up, adjusted TRs for overall survival were 1.05 (95% CI 0.74 to 1.50, p=0.766) in the not monthly but sometimes group, 1.64 (95% CI 1.01 to 2.65, p=0.046) in the not weekly but at least once/month group, 1.23 (95% CI 0.73 to 2.07, p=0.434) in the not daily but at least once/week group, and 3.04 (95% CI 1.69 to 5.47, p<0.001) in the almost everyday group versus the never group. Stratified and sensitivity analysis revealed similar results.

CONCLUSION

Frequent participation in social activity was significantly associated with prolonged overall survival in older people. However, only participating in social activity almost every day could significantly prolong long-term survival.