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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.