Table 3.

Cross-tabulation of quartiles for the composite ISA and composite PPR

	ISA Quartiles
Quartiles of Medical Density (PPR)	[10.41; 29.58]	[29.58; 38,16]	[38.16; 48.31]	[48.31; 91.98]	Total
0	211	130	106	68	518
[0; 16.12]	17	50	50	41	158
[16.12; 42.96]	72	93	81	89	335
[42.96; 1119.94]	37	63	100	135	335
Total	337	336	337	336	1346