Table 3.
Overall and per-groups analysis of microbiological characteristics
| Overall SSI (n = 320) | PRE-Int SSI (n = 225) | POST-Int SSI (n = 95) | p-value | |
|---|---|---|---|---|
| Swab Performed, n (col %) | 0.887 | |||
| Yes | 280 (87.5) | 197 (87.5) | 83 (87.4) | |
| No | 40 (12.5) | 28 (12.5) | 12 (12.6) | |
| Swab result, n (col %) | n = 280 | n = 197 | n = 83 | 0.001 |
| No bacterial growth | 112 (40) | 91 (45.2) | 21 (25.3) | |
| Bacterial Growth | 168 (60) | 106 (53.8) | 62 (74.7) | |
| Isolated pathogen, n (col %) | n = 168 | n = 106 | n = 62 | < 0.001 |
| Gram-positive | 127 (75.6) | 90 (84.9) | 37 (59.7) | |
| Gram-negative | 41 (24.4) | 16 (15.1) | 25 (40.3) | |
| Gram positive, n (col %) | n = 127 | n = 90 | n = 37 | |
| Staphylococcus aureus | 57 (44.9) | 43 (40.6) | 14 (37.9) | |
| MRSA | 37 (64.9) | 34 (79.0) | 3 (21.4) | |
| Coagulase-negative Staphylococcus species | 57 (44.9) | 47 (44.4) | 10 (27.0) | |
| Streptococcus A | 3 (2.4) | 0 | 3 (8.1) | |
| Enterococcus spp. | 10 (7.8) | 0 | 10 (27.0) | |
| Gram negative, n (%) | n = 41 | n = 16 | n = 25 | |
| Escherichia Coli | 4 (9.8) | 1 (6.3) | 3 (12.0) | |
| MDROs | 2 (50.0) | 1 (100) | 1 (33.4) | |
| Proteus mirabilis | 4 (9.8) | 3 (18.7) | 1 (4.0) | |
| MDROs | 1 (25.0) | 1 (33.4) | 0 | |
| Klebsiella spp. | 11 (26.8) | 4 (25.0) | 7 (28.0) | |
| MDR0s | 7 (63.6) | 4 (100) | 3 (42.8) | |
| Pseudomonas aeruginosa | 6 (14.6) | 1 (6.3) | 5 (20.0) | |
| MDROs | 4 (66.7) | 1 (100) | 3 (60.0) | |
| Other GRAM-negative | 16 (39.0) | 7 (43.7) | 9 (36.0) | |
| MDROs | 7 (43.7) | 2 (28.6) | 5 (55.6) | |
| Total MRSA, n (isolated pathogens %) | 37 (22) | 34 (32.0) | 3 (4.8) | < 0.001 |
| Total gram negative MDROs, n (isolated pathogens %) | 22 (13) | 9 (8.5) | 12 (19.3) | 0.052 |
MRSA Methicillin-Resistant Staphylococcus aureus, MDROs Multidrug Resistant Organisms