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Table 1 Pearson correlation coefficient and number of samples (N) between different indicators

From: Transport indicator analysis and comparison of 151 urban areas, based on open source data

Pearson Correlation Coefficient Metropolises Mature Cities Small Cities All Cities
Spatial city area (Km^2) and annual population growth 0,534 (N = 44) 0,513 (N = 55) 0,449 (N = 150)
Population density and ADETT 0,520 (N = 37) 0,545 (N = 55) 0,502 (N = 143)
Population density and GDP per capita − 0,530 (N = 42) − 0,283 (N = 56) − 0,404 (N = 139)
GDP per capita and ADETT − 0,512 (N = 36) − 0,304 (N = 55) − 0,332 (N = 132)
GDP per capita and road IA 0,714 (N = 42) 0,571 (N = 56) 0,559 (N = 139)
GDP per capita and rail IA 0,581 (N = 38) 0,475 (N = 47) 0,355 (N = 124)
GDP per capita and cycle IA 0,477 (N = 30) 0,343 (N = 43)
ADETT and road IA −0,608 (N = 37) −0,750 (N = 55) − 0,587 (N = 51) −0,664 (N = 143)
ADETT and train IA −0,626 (N = 34) −0,338 (N = 46) − 0,387 (N = 127)
ADETT and cycle IA −0,358 (N = 27) -0,303 (N = 43) -0,427 (N = 42) -0,337 (N = 112)