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Table 4 Correlation between population and size (km2) with each variable

From: The effect of the development of an emergency transfer system on the travel time to tertiary care centres in Japan

  Pearson's correlation Spearman's correlation
  Population Size (km2) Population Size (km2)
Population   -0.24   0.11
Average travel time (min) -0.61 0.47 -0.50 0.54
Pavement ratio (%) 0.52 -0.55 0.03 -0.57
Size (km2) -0.24   0.11  
Kilometres of general road 0.33 0.53 0.65 0.62
Kilometres of express road 0.05 0.68 0.44 0.64
Mountain area (km2) -0.36 0.90a -0.16 0.85a
Total kilometres of all roads 0.44 0.48 0.76 0.56
Road area (km2) 0.56 0.43 0.81a 0.49
Kilometres of impassable road 0.28 0.23 0.64 0.30
Maintenance ratio of general road (%) 0.19 -0.15 0.01 -0.18
Number of tertiary care centres 0.91a -0.20 0.83a 0.02
Number of fire stations 0.95a -0.06 0.88a 0.20
Percentage of emergency team with EMT to all emergency teams (%) 0.54 -0.31 0.37 -0.29
Number of ambulances 0.94a -0.03 0.94a 0.23
Number of emergency teams 0.91a 0.02 0.93a 0.24
Number of emergency teams with EMT 0.97a -0.14 0.90a 0.14
Number of EMT 0.97a -0.21 0.92a 0.10
Number of emergency crews 0.76 0.15 0.89a 0.24
Number of emergency medical specialists 0.90a -0.24 0.77 -0.03
Number of tertiary hospitals 0.89a -0.22 0.75 -0.04
Number of secondary hospitals 0.94a -0.20 0.88a 0.05
Number of primary hospitals 0.44 -0.03 0.41 -0.05
  1. aCoefficient correlation of >0.8.