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Table 3 List of measures of accessibility computed

From: The approaches to measuring the potential spatial access to urban health services revisited: distance types and aggregation-error issues

  Distance type
1. Minimum distance
2. Average distance to all hospitals
3. Average distance to three closest hospitals
4. Average distance to five closest hospitals
5. Number of hospitals within 500 m or 10 min
6. Number of hospitals within 1000 m or 20 min
7. Number of hospitals within 2000 m or 30 min
8. Potential gravity model (friction parameter = 1)
9. Potential gravity model (friction parameter = 1.5)
10. Potential gravity model (friction parameter = 2)
11. Two-step floating catchment area (2000 m or 30 min)
12. Enhanced two-step floating catchment area with a slow step-decay functiona
13. Enhanced two-step floating catchment area with a fast step-decay functiona
14. Enhanced two-step floating catchment area with a gradient function
  1. aThe catchment area is divided into three zones: 0–500 m or 0–10 min, 500–1000 m or 10–20 min, and 1000–2000 m or 20–30 min