Table 3. Spearman correlations between nine GIS-based measures in access to mammography in St. Louis.

	DST	DST5	DES	SAU	SAC	SA3Q	SA3S	SA6Q	SA6S
DST	1.00	0.8448	0.1320	0.1633	−0.2431	−0.3160	−0.2291	−0.4060	−0.1678
DST5	-	1.00	0.0764	0.0867	−0.4083	−0.4846	−0.3889	−0.5797	−0.3183
DES	-	-	1.00	0.5064	0.3765	0.3351	0.3819	0.2857	0.4114
SAU	-	-	-	1.00	0.7751	0.6914	0.7782	0.6060	0.8302
SAC	-	-	-	-	1.00	0.9514	0.9703	0.9343	0.9769
SA3Q	-	-	-	-	-	1.00	0.9838	0.9722	0.9448
SA3S	-	-	-	-	-	-	1.00	0.9326	0.9807
SA6Q	-	-	-	-	-	-	-	1.00	0.8963
SA6S	-	-	-	-	-	-	-	-	1.00

(DST: shortest travel time; DST5: average of 5 shortest travel time; DES: density; SAU: spatial accessibility index from the model without weighting parameter; SAC: spatial accessibility index from the model with continuous weighting parameter; SA3Q: spatial accessibility index from the zonal weighted model with 3 time zones and quick decay weighting; SA3S: spatial accessibility index from the zonal weighted model with 3 time zones and slow decay weighting; SA6Q: spatial accessibility index from the zonal weighted model with 6 time zones and quick decay weighting; SA6S: spatial accessibility index from the zonal weighted model with 6 time zones and slow decay weighting.); all coefficients are statistically significant.