Table 2.

Variables and definitions.

Type of Variable	Variable	Symbol	Meaning
explained	economic growth	VGDP	Regional GDP/regional total population
explanatory	Population aging index	AoP	The index of regional population aging calculated by the entropy method
metavariable	Pension insurance expenditure	PFE	Pension insurance fund expenditure
	Medical and health expenditure	MPE	Financial expenditure on medical care and health care
controlled	Urbanization rate	UBR	Town population/Total population
	Demographic education	PEL	College or above/6 and above
	Natural population growth rate	N PGR	(Number of births within year-number of deaths within year)/average year