Funding for this research was provided by:
the National Social Science Foundation of China (No. CHA250293)
Article History
Received: 19 January 2026
Accepted: 16 March 2026
First Online: 20 March 2026
Declarations
:
: All study procedures involving human participants followed institutional and/or national research committee ethical standards and the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study has been approved by the Academic and Ethics Committee of Northeast Normal University. The OECD has officially conducted the ethical norms for all participating countries/economies in SSES 2019. The individual participants received in-depth information about SSES 2019 and provided their informed consent upon participation prior to the study. The informed consent to participate was obtained from the parents or legal guardians of any participant under the age of 16. The students and principals were voluntary to participate in SSES 2019, and they could withdraw upon their own decision. All methods were performed in accordance with the relevant guidelines and regulations.
: Not applicable.
: The authors declare no competing interests.