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Table 1 Description of GI predictor variables used in the multi-level linear regression analysis in this study

From: Relationships between health outcomes in older populations and urban green infrastructure size, quality and proximity

Predictor variableDescriptionExpressed as:Use in regression analysis
Total non-built land-coverAggregated proportion of land-cover that consists of vegetation or water.% cover LSOAˉ1Step 1
WaterProportion of land-cover by water (water bodies and water courses)% cover LSOAˉ1Step 2 and 3
Ground layer vegetationProportion of land-cover by grass lawns and other ground flora% cover LSOAˉ1Step 2 and 3
Field layer vegetationProportion of land-cover by tall grasses, forbs and shrubs% cover LSOAˉ1Step 2 and 3
CanopyProportion of land-cover by trees% cover LSOAˉ1Step 2 and 3
Public parks and recreationProportion of land-use that includes public parks, sports grounds, playing fields, allotments and community gardens% cover LSOAˉ1Step 2 and 3
Amenity green-spaceProportion of land-use consisting of landscaped open spaces in residential or commercial areas with primarily aesthetic functions% cover LSOAˉ1Step 2 and 3
Private gardensProportion of land-use by private domestics gardens% cover LSOAˉ1Step 2 and 3
Peri-urbanProportion of non-urban land-use, primarily consisting of arable land, grazed pasture and peat moorland outside of the main urban extent of the study area but within the Greater Manchester administrative boundary% cover LSOAˉ1Step 2 and 3
Previously developed landProportion of land previously subject to development and without any formal function at the time of data production% cover LSOAˉ1Step 2 and 3
Urban fabricProportion of all developed (built) land-use types and associated built infrastructure including residential, commercial, transport and industrial% cover LSOAˉ1Step 2 and 3
Informal urban greeneryProportion of non-built land-cover occurring within the urban fabric class but without formal designated use (e.g. street trees, roadside vegetation).% cover LSOAˉ1Step 2 and 3
% population ≤ 300 m to public parks and recreation landProportion of the local population living within 300 m of any site in the public parks and recreation class (including sites within 300 m but in neighbouring LSOAs).% population LSOAˉ1Step 2 and 3
% population ≤ 200 m to public parks and recreation landProportion of the local population living within 200 m of any site within the public parks and recreation class% population LSOAˉ1Step 2 and 3
% population ≤ 100 m to public parks and recreation landProportion of the local population living within 100 m of any site within the public parks and recreation class% population LSOAˉ1Step 2 and 3
% population ≤ 200 m to 2 ha public parks and recreation landProportion of the local population living within 200 m of sites > 2 ha within the public parks and recreation class% population LSOAˉ1Step 2 and 3
Shannon’s Diversity Index (SHDI)Metric indicating land-cover diversityDimensionless with values starting from 0 without limit (though rarely exceeding 4)Step 2 and 3
Mean Patch SizeMean area of all non-built patchesm2 LSOAˉ1Step 2 and 3
Effective Mesh Size (Meff)Measure of connectedness of non-built land-coverm2 LSOAˉ1Step 2 and 3
% non-built cover in gardensProportion of gardens that is vegetation or waterPercentage of total gardens cover LSOAˉ1 that is non-builtStep 3
% non-built cover in amenity green-spaceProportion of amenity green-space that is vegetation or waterPercentage of total gardens cover LSOAˉ1 that is non-builtStep 3
% non-built cover in public parks and recreation landProportion of public parks and recreation land that is vegetation or waterPercentage of total gardens cover LSOAˉ1 that is non-builtStep 3
% non-built cover in institutional landProportion of institutional land that is vegetation or waterPercentage of total gardens cover LSOAˉ1 that is non-builtStep 3
Mean patch size of gardensMean area of garden land-use patchesm2 LSOAˉ1Step 3
Mean patch size of amenity green-spaceMean area of amenity green-space land-use patchesm2 LSOAˉ1Step 3
Mean patch size of public parks and recreation landMean area of public parks and recreation land-use patchesm2 LSOAˉ1Step 3
Mean patch size of institutional landMean area of institutional land-use patchesm2 LSOAˉ1Step 3