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Table 3 Resultant change of access scores with the addition of two different variable catchment size functions, by population size

From: Spatial accessibility of primary health care utilising the two step floating catchment area method: an assessment of recent improvements

  Access category (Aiscore range)
1>0.0012 2>0.001 3>0.0009 4>0.0008 5>0.0007 6>0.0006 7>0.0005 8>0.0004 9>0.0003 10<0.0003
Luo and Whippo’s approach (net change from crude access scores with slow-step decay)^1
>100K −250 −600 −521 127 −74 255 624 326 125 −11
25-100K 0 −63 −79 −55 67 67 34 29 0 0
5-25K −10 −47 −44 −25 21 46 13 17 28 1
1.5-5K −6 −9 −6 −11 −13 5 32 0 1 7
<1.5K −3 −15 −29 −30 −38 1 18 34 32 29
McGrail and Humphreys’ approach (net change from crude access scores with slow-step decay)^1
>100K −406 −480 −313 201 363 452 185 37 −29 −11
25-100K 0 −35 −47 39 31 8 29 −25 0 0
5-25K −10 −41 −18 9 41 6 −16 14 10 4
1.5-5K −6 −7 −15 7 −6 10 11 13 −8 0
<1.5K −2 −11 −17 −14 7 4 −13 2 13 30
  1. All figures within the table are ‘000s.
  2. ^1: The base (comparison) model is a crude 2SFCA method with the addition of a slow step-decay function. These values represent the net population change (‘000s) within each population size group to the corresponding access scores following the addition of each distance-decay function. Negative values indicate a net drop in the number of residents with access scores in that category. All row totals equal 0.