Table 1 Risk factors associated with superficial surgical site infection in complicated appendicitis
Risk factors | No SSI | SSI | P value |
|---|---|---|---|
Patient-related | |||
Gender, number (%) | |||
Male | 291 (90.9) | 29 (9.1) | 0.773 |
Female | 255 (91.7) | 23 (8.3) | |
Age, year, mean (SD) | 45.5 (0.78) | 44.4 (2.31) | 0.674 |
BMI, kg/m2, mean (SD) | 23.3 (0.19) | 24.5 (0.48) | 0.023 |
Smoking, number (%) | |||
Yes | 85 (90.4) | 9 (9.6) | 0.693 |
No | 460 (91.2) | 43 (8.6) | |
ASA classification, number (%) | |||
Class I | 319 (92.7) | 25 (7.3) | 0.290 |
Class II | 151 (88.8) | 19 (11.2) | |
Class III | 65 (90.1) | 7 (9.7) | |
Class IV | 5 (83.3) | 1 (16.7) | |
Diabetes, number (%) | |||
Yes | 40 (78.4) | 11 (21.6) | 0.001 |
No | 502 (92.5) | 41 (7.5) | |
Hypertension, number (%) | |||
Yes | 104 (91.2) | 10 (8.8) | 0.989 |
No | 439 (91.3) | 42 (8.7) | |
Duration of symptoms, hours, median (IQR) | 24 (14, 48) | 24 (24, 48) | 0.055 |
Presence of fever (≥ 37.8 °C), number (%) | |||
Yes | 284 (92.2) | 24 (7.8) | 0.389 |
No | 258 (90.2) | 28 (9.8) | |
White blood cell count, cell/mm3, mean (SD) | 15,563 (4998) | 16,658 (4551) | 0.130 |
Hct < 30%, number (%) | |||
Yes | 25 (92.6) | 2 (7.4%) | 0.821 |
No | 517 (91.3) | 49 (8.7%) | |
Operative-related | |||
Appendicitis severity classification, number (%) | |||
Gangrene | 141 (97.2) | 4 (2.8) | 0.004 |
Ruptured | 405 (89.4) | 48 (10.6) | |
No SSI | SSI | P value | |
Wound | |||
Incisional length, cm, mean (SD) | 5.6 (2.24) | 6.9 (2.62) | < 0.001 |
Subcutaneous fat thickness, cm, mean (SD) | 3.0 (2.00) | 3.7 (2.20) | 0.033 |
Visible wound contamination, number (%) | |||
Exudative fluid | |||
Yes | 147 (88.6) | 19 (11.6) | 0.139 |
No | 399 (92.4) | 33 (7.6) | |
Purulent fluid | |||
Yes | 202 (90.2) | 22 (9.8) | 0.450 |
No | 344 (92.0) | 30 (8.0) | |
Fecal contamination, number (%) | |||
Yes | 143 (85.1) | 25 (14.9) | 0.001 |
No | 378 (93.8) | 25 (6.2) | |
Operative time (minutes), number (%) | |||
≤ 75 | 129 (83.8) | 25 (16.2) | < 0.001 |
> 75 | 412 (93.9) | 27 (6.2) | |
Used of closed suction drain, number (%) | |||
Yes | 109 (93.2) | 8 (6.8) | 0.413 |
No | 433 (90.8) | 44 (9.2) | |