Table 3 Distribution of the number of cities at different levels of HQID.

From: Measurement and spatio-temporal evolution of high-quality industrial development level in China

Division of grades

2003

2010

2016

2022

Low level areas

151

56

9

6

Medium–low level areas

117

180

132

87

Medium level areas

17

44

107

126

Medium–high level areas

1

6

36

47

High level areas

0

0

2

20

Total

286

286

286

286