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Haiyan Zhu, Qiushi Feng, and Danan Gu

mental, and chronic disease conditions. More importantly, the predictive power of IRH on mortality
generally performs better than that of SRH. Our findings suggest that it would be a good strategy for
surveys to include IRH at the end of the interview and also collect information on
ers’ characteristics to help improve our understanding of IRH and disentangle its predictive power
independent of SRH.
Acknowledgements

The Open Access Subvention Fund at Virginia Tech supported the publication of this article.

Authors’ Contributions

HZ designed the study and performed the analysis. HZ drafted and revised the text. FQ drafted and
revised the text. DG co-designed the study and co-performed the analysis. DG also revised the text.

Conflict of Interest and Funding
The authors declare that there is no conflict of interest and they have no financial support for this
study.

Ethics Approval and Consent to Participate

No ethics approval was required for this study because the datasets used are obtained from a publicly
accessible database of the Chinese Longitudinal Healthy Longevity Survey (http://www.icpsr.umich.
edu/icpsrweb/NACDA/studies/36179) with a signed data user agreement.
Availability of Data and Materials

The CLHLS datasets are publicly available at http://www.icpsr.umich.edu/icpsrweb/NACDA/stu-
dies/36179.
Disclaimer

Views expressed in this paper are solely those of the authors and do not necessarily reflect the views
of Virginia Tech, National University of Singapore, or the United Nations.

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