Creating a replicable, valid cross-platform buffering technique: The sausage network buffer for measuring food and physical activity built environments

Forsyth, Ann; Van Riper, David; Larson, Nicole; Wall, Melanie; Neumark-Sztainer, Dianne

doi:10.1186/1476-072X-11-14

International Journal of Health Geographics

Table 2 Descriptive Statistics for Five Variables Measured Using Different Buffer Types for 1600 Meter Buffers ^a

From: Creating a replicable, valid cross-platform buffering technique: The sausage network buffer for measuring food and physical activity built environments

				Lower	Upper
	Mean	Std	Median	Quartile	Quartile	Min	Max
Fast Food Count
Sausage buffer	5.77	5.33	5	2	8	0	61
ArcView 3.3.	5.68	5.28	5	2	8	0	61
Detailed, no trim ArcGIS 9.3	5.33	5.03	5	2	7	0	60
Detailed, trimmed ArcGIS 9.3 ^b	5.35	5.03	5	2	7	0	60
Generalized, no trim ArcGIS 9.3	5.31	5.02	5	2	7	0	60
Generalized, trimmed ArcGIS 9.3	5.37	5.03	5	2	7	0	60
Fast Food Density count/ha
Sausage buffer	0.0123	0.0107	0.0105	0.0055	0.0162	0	0.1198
ArcView 3.3.	0.0118	0.0105	0.0101	0.0047	0.0158	0	0.1166
Detailed, no trim ArcGIS 9.3	0.0126	0.0115	0.0108	0.0046	0.0171	0	0.1378
Detailed, trimmed ArcGIS 9.3	0.0130	0.0117	0.0112	0.0050	0.0176	0	0.1415
Generalized, no trim ArcGIS 9.3	0.0124	0.0112	0.0107	0.0047	0.0169	0	0.1254
Generalized, trimmed ArcGIS 9.3	0.0127	0.0113	0.0109	0.0050	0.0172	0	0.1324
Convenience Store Count
Sausage buffer	4.80	2.84	5	3	6	0	29
ArcView 3.3.	4.71	2.81	4	3	6	0	29
Detailed, no trim ArcGIS 9.3	4.44	2.72	4	3	6	0	27
Detailed, trimmed ArcGIS 9.3	4.46	2.71	4	3	6	0	27
Generalized, no trim ArcGIS 9.3	4.43	2.71	4	3	6	0	28
Generalized, trimmed ArcGIS 9.3	4.47	2.71	4	3	6	0	28
Convenience Store Density
Sausage buffer	0.0102	0.0055	0.0099	0.0065	0.0135	0	0.0526
ArcView 3.3.	0.0098	0.0054	0.0096	0.0061	0.0127	0	0.0526
Detailed, no trim ArcGIS 9.3	0.0105	0.0060	0.0102	0.0065	0.0138	0	0.0604
Detailed, trimmed ArcGIS 9.3	0.0108	0.0059	0.0105	0.0069	0.0141	0	0.0621
Generalized, no trim ArcGIS 9.3	0.0104	0.0058	0.0102	0.0065	0.0135	0	0.0547
Generalized, trimmed ArcGIS 9.3	0.0106	0.0057	0.0104	0.0068	0.0139	0	0.0581
Percent Open Space
Sausage buffer	7.4	5.5	5.6	3.9	9.6	0	55.5
ArcView 3.3.	7.8	6.5	5.7	3.8	10.0	0	69.0
Detailed, no trim ArcGIS 9.3	7.9	6.9	5.6	3.8	9.8	0	65.4
Detailed, trimmed ArcGIS 9.3	7.0	5.0	5.4	3.8	8.8	0	59.5
Generalized, no trim ArcGIS 9.3	7.5	6.4	5.4	3.6	9.5	0	56.5
Generalized, trimmed ArcGIS 9.3	6.9	4.8	5.5	3.8	8.9	0	48.3

a. Measured for N = 2724 buffers.
b. Trim is set at 100 m.

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ISSN: 1476-072X

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