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Table 2 Patient characteristics by socioeconomic status quintile * All p-values based on Wald chi-square tests.

From: Disparities in the use of ambulatory surgical centers: a cross sectional study

  Socioeconomic Status (Quintiles) p-value*
  1 (Lowest) 2 3 4 5 (Highest)  
Number of Discharges 208557 (18%) 222873 (20%) 236339 (21%) 233973 (21%) 236385 (21%)  
No. at ASC 124183 (60%) 143567 (64%) 157743 (67%) 151954 (65%) 152636 (65%) <0.001
Procedure       <0.001
Cataract Surgery 49360 (24%) 52094 (23%) 55089 (23%) 53681 (23%) 49351 (21%)  
Urologic 26881 (13%) 27327 (12%) 29075 (12%) 28349 (12%) 27520 (12%)  
Upper GI 35659 (17%) 35800 (16%) 37711 (16%) 35453 (15%) 32941 (14%)  
Lower GI 87010 (42%) 96355 (43%) 102946 (44%) 104226 (45%) 113070 (48%)  
Knee Arthroscopy 9647 5%) 11297 (5%) 11518 (5%) 12264 (5%) 13503 (6%)  
Age       <0.001
≤ 19 7750 (4%) 6442 (3%) 5659 (2%) 5489 (2%) 6064 (3%)  
20–39 16006 (8%) 16211 (7%) 15474 (7%) 15600 (7%) 14902 (6%)  
40–59 62732 (30%) 64420 (29%) 66793 (28%) 67199 (29%) 75172 (32%)  
60–79 100871 (48%) 108634 (49%) 117674 (50%) 113312 (48%) 110414 (47%)  
80+ 21198 (10%) 27166 (12%) 30739 (13%) 32373 (14%) 29833 (13%)  
Race/Ethnicity       <0.001
White 130718 (63%) 174813 (79%) 197407 (85%) 197427 (85%) 204753 (88%)  
Black 35198 (17%) 16886 (8%) 10097 (4%) 8661 (4%) 5981 (3%)  
Hispanic 34416 (17%) 22541 (10%) 20216 (9%) 18205 (8%) 13576 (6%)  
Other 5555 (3%) 5930 (3%) 5805 (2%) 6638 (3%) 7620 (3%)  
Insurance Status       <0.001
Medicare/Commercial 180433 (87%) 201681 (91%) 218819 (93%) 218483 (93%) 224437 (95%)  
Self Pay/No Insurance 5741 (3%) 4790 (2%) 4027 (2%) 4251 (2%) 4000 (2%)  
Medicaid/Other Governmental 22361 (11%) 16361 (7%) 13448 (6%) 11194 (5%) 7902 (3%)  
No. Female 114616 (55%) 120988 (54%) 126251 (53%) 123491 (53%) 120934 (51%) <0.001
Comorbidity       <0.001
0 165450 (79%) 182736 (82%) 194925 (82%) 194940 (83%) 199529 (84%)  
1 26321 (13%) 25967 (12%) 26726 (11%) 26442 (11%) 25436 (11%)  
2 12134 (6%) 10531 (5%) 10763 (5%) 9463 (4%) 8691 (4%)  
3+ 4651 (2%) 3639 (1%) 3925 (2%) 3128 (2%) 2729 (1%)  
Urban/Rural       <0.001
Non-Urban adjacent to urban (ref) 108704 (52%) 121515 (55%) 122051 (52%) 130293 (56%) 152543 (65%)  
Large Metropolitan 56499 (27%) 86496 (39%) 101347 (43%) 96531 (41%) 83842 (35%)  
Small Metropolitan 25063 (12%) 13396 (6%) 12330 (5%) 6322 (2%) 0  
Micropolitan 18291 (9%) 1466 1%) 611 (<1%) 827 (<1%) 0  
  1. * All p-values based on Wald chi-square tests.