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This is a useful study. May I suggest that the Output Area Classification (OAC) offers similar insights based on social groupings. Several studies have explored the use of the OAC relating to A&E attendance and Critical Care admission [1-3]. I suspect that your data is amenable to further helpful analysis using the OAC.
1. Beeknoo N, Jones R. Factors influencing A&E attendance, admissions and waiting times at two London hospitals. British Journal of Medicine and Medical Research 2016; 17(10): 1-29. doi : 10.9734/BJMMR/2016/28783
2. Beeknoo N, Jones R. Using Social Groups to Locate Areas with High Emergency Department Attendance, Subsequent Inpatient Admission and Need for Critical Care. British Journal of Medicine and Medical Research 2016; 18(6): 1-23. doi: 10.9734/BJMMR/2016/29208
3. Beeknoo N, Jones R. Using social groups to locate areas of high utilization of critical care. BBritish Journal of Healthcare Management 2016; 22(11): 551-560.