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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

   Pre-match   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)