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Table 4 Spearman rank correlation coefficients (r) between different impedance measures and same health facility identified as closest using different impedance measures (%) for impedance measures calculated to closest delivery facility

From: Methods to measure potential spatial access to delivery care in low- and middle-income countries: a case study in rural Ghana

  Euclidean distance Network distance Mechanized network time Non-mechanized network time Mechanized raster time
  r % r % r % r % r %
Compound as origin 1
Network distance (km) 0.9330 91.6 1        
Mechanized network time (hr) 0.3904 89.6 0.5485 97.0 1      
Non-mechanized network time (hr) 0.8921 91.6 0.9824 100 0.6681 97.0 1    
Mechanized raster time (hr) 0.3785 72.9 0.4519 68.7 0.7226 67.8 0.5335 68.7 1  
Non-mechanized raster time (hr) 0.8763 91.0 0.8978 90.7 0.6649 88.5 0.9278 90.7 0.6748 73.6
Village as origin 2
Network distance (km) 0.9584 80.4 1        
Mechanized network time (hr) 0.5885 78.8 0.6842 98.5 1      
Non-mechanized network time (hr) 0.9529 80.4 0.9983 100 0.7177 96.5 1    
Mechanized raster time (hr) 0.5804 64.9 0.6389 72.5 0.7964 73.4 0.6616 72.5 1  
Non-mechanized raster time (hr) 0.9404 80.6 0.9813 91.0 0.7497 89.8 0.9876 91.0 0.7247 76.2
  1. 1n = 47,537 compounds 2n = 433 villages; n = 64 delivery facilities.