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Table 2 Sensitivity (%) of approximation methods versus map-based measures for sample areas in Aberdeenshire and Ayrshire

From: The performance of approximations of farm contiguity compared to contiguity defined using detailed geographical information in two sample areas in Scotland: implications for foot-and-mouth disease modelling

   Current method
   All premises <1 km point distance All premises <3 km point distance All premises <5 km point distance All premises <26 m field distance All premises <151 m field distance All premises <1 km field distance By Voronoi tessellation By area weighted tessellation
Aberdeenshire          
Gold standard All <15 m 29.4 90.8 94.8 100.0 100.0 100.0 73.2 82.4
All <15 m - river 30.1 91.6 95.8 100.0 100.0 100.0 73.4 82.5
All <15 m - road 29.2 92.3 94.6 100.0 100.0 100.0 73.1 83.1
All <15 m - river/road 30.0 93.3 95.8 100.0 100.0 100.0 73.3 83.3
All <15 m - river/road/ditch 31.2 92.7 95.4 100.0 100.0 100.0 72.5 83.5
All <15 m - river/ditch 32.0 90.6 95.3 100.0 100.0 100.0 72.7 82.8
Shared fence 29.5 92.6 95.9 100.0 100.0 100.0 75.4 84.4
Shared fence - river 29.7 92.4 95.8 100.0 100.0 100.0 74.6 83.9
  Shared fence - river/ditch 31.5 91.7 95.4 100.0 100.0 100.0 74.1 84.3
Ayrshire          
Gold standard All <15 m 32.8 87.1 95.7 100.0 100.0 100.0 62.6 67.2
All <15 m - river 33.2 86.3 95.7 100.0 100.0 100.0 62.4 67.1
All <15 m - road 32.3 88.3 96.7 100.0 100.0 100.0 64.3 69.0
All <15 m - river/road 32.8 87.6 96.7 100.0 100.0 100.0 64.2 69.0
All <15 m - river/road/ditch 35.5 87.9 96.8 100.0 100.0 100.0 64.9 69.0
All <15 m - river/ditch 35.6 86.8 95.9 100.0 100.0 100.0 63.1 67.1
Shared fence 32.9 87.6 96.5 100.0 100.0 100.0 62.5 67.5
Shared fence - river 33.5 87.2 96.6 100.0 100.0 100.0 63.2 68.0
Shared fence - river/ditch 36.0 87.6 96.7 100.0 100.0 100.0 64.0 68.2