Table 2 Comparison of baseline characteristics by surgical site infection status pre- and post-match in the total hip arthroplasty cohort
From: Economic burden of surgical site infections within the episode of care following joint replacement
| Â | Â | Pre-match | Â | Post-match |
|---|---|---|---|---|
Total | No SSI | SSI | No SSI | |
N | 48,143 | 47,740 | 403 | 403 |
Mean age (SD) | 65.45 (10.87) | 65.46 (10.87) | 64.81 (10.99) | 64.59 (10.86) |
Sex (%) | ||||
 Male | 22,000 (45.7) | 21,822 (45.71) | 178 (44.17) | 189 (46.9) |
 Female | 26,143 (54.3) | 25,918 (54.29) | 225 (55.83) | 214 (53.1) |
Payer (%) | ||||
 Medicare | 26,264 (54.6) | 26,029 (54.52) | 235 (58.31) | 231 (57.32) |
 Medicaid | 1459 (3.03) | 1432 (3) | 27 (6.7) | 30 (7.44) |
 Private insurance | 18,504 (38.47) | 18,376 (38.49) | 128 (31.76) | 130 (32.26) |
 Self-pay | 315 (0.65) | 314 (0.66) | 1 (0.25) | 2 (0.5) |
 No charge | 61 (0.13) | 59 (0.12) | 2 (0.5) | 2 (0.5) |
 Other | 1502 (3.12) | 1493 (3.13) | 9 (2.23) | 7 (1.74) |
 Unknown | 38 (0.00) | 37 (0.08) | 1 (0.25) | 1 (0.25) |
Hospital bedsize (%) | ||||
 Small | 7500 (15.58) | 7444 (15.59) | 56 (13.9) | 52 (12.9) |
 Medium | 12,482 (25.93) | 12,380 (25.93) | 102 (25.31) | 96 (23.82) |
 Large | 28,161 (58.49) | 27,916 (58.48) | 245 (60.79) | 255 (63.28) |
Zip income quartile (%) | ||||
 0–25th percentile | 9457 (19.95) | 9367 (19.62) | 90 (22.33) | 94 (23.33) |
 26th–50th percentile | 12,301 (25.95) | 12,192 (25.54) | 109 (27.05) | 107 (26.55) |
 51st–75th percentile | 13,035 (27.5) | 12,929 (27.08) | 106 (26.3) | 103 (25.56) |
 76th–100th percentile | 12,604 (26.59) | 12,512 (26.21) | 92 (22.83) | 95 (23.57) |
 Unknown | 746 (0.00) | 740 (1.55) | 6 (1.49) | 4 (0.99) |
Hospital teaching status (%) | ||||
 Metropolitan non-teaching | 22,070 (45.84) | 21,863 (45.8) | 207 (51.36) | 200 (49.63) |
 Metropolitan teaching | 21,865 (45.42) | 21,707 (45.47) | 158 (39.21) | 166 (41.19) |
 Non-metropolitan teaching | 4208 (8.74) | 4170 (8.73) | 38 (9.43) | 37 (9.18) |
Comorbidity Index (%) | ||||
 0–1 | 37,938 (78.8) | 37,627 (78.82) | 311 (77.17) | 316 (78.41) |
 2–3 | 3873 (8.04) | 3843 (8.05) | 30 (7.44) | 24 (5.96) |
 > 3 | 6332 (13.15) | 6270 (13.13) | 62 (15.38) | 63 (15.63) |