Table 4.
Return to hospital within 60 days
| Characteristic | Category | Univariable OR (95% c.i.), P | Multivariable OR (95% c.i.), P |
|---|---|---|---|
| Postoperative antibiotics | No | Reference | Reference |
| Yes—≥3 days total | 1.11 (0.79–1.55), 0.547 | 0.99 (0.70–1.41), 0.976 | |
| Yes—<3 days total | 0.78 (0.39–1.44), 0.448 | 0.75 (0.37–1.41), 0.398 | |
| Anaesthetic type | General anaesthetic | Reference | Reference |
| Local anaesthetic | 0.97 (0.68–1.36), 0.841 | 1.00 (0.70–1.42), 0.995 | |
| Age (years) | 18–25 | Reference | – |
| 26–35 | 1.14 (0.69–1.91), 0.614 | – | |
| 36–45 | 0.84 (0.48–1.48), 0.551 | – | |
| 46–55 | 0.94 (0.55–1.63), 0.832 | – | |
| 56–65 | 1.07 (0.59–1.90), 0.830 | – | |
| >65 | 0.79 (0.42–1.46), 0.454 | – | |
| Sex | Male | Reference | – |
| Female | 0.88 (0.64–1.22), 0.459 | – | |
| Smoking status | Current smoker | Reference | – |
| Previous smoker | 0.86 (0.50–1.43), 0.564 | – | |
| Never smoked | 0.82 (0.58–1.18), 0.278 | – | |
| BMI (kg/m2), mean(s.d.) | – | 1.03 (1.01–1.06), 0.002 | 1.03 (1.01–1.06), 0.003 |
| Hidradenitis suppurativa | No | Reference | – |
| Yes | 1.85 (1.04–3.16), 0.028 | – | |
| Immunosuppression | No | Reference | Reference |
| Yes | 1.92 (0.90–3.82), 0.073 | 1.95 (0.90–3.93), 0.073 | |
| Diabetes mellitus | No | Reference | – |
| Yes | 1.37 (0.90–2.04), 0.135 | – | |
| Abscess position | Abdominal wall—anterior | Reference | – |
| Abdominal wall—posterior | 0.53 (0.17–1.41), 0.232 | – | |
| Axilla | 0.47 (0.19–1.05), 0.075 | – | |
| Buttock | 0.51 (0.25–1.02), 0.059 | – | |
| Groin | 0.69 (0.35–1.36), 0.282 | – | |
| Lower limb—proximal | 1.04 (0.40–2.56), 0.928 | – | |
| Upper limb—proximal | 0.75 (0.35–1.56), 0.446 | – | |
| Pilonidal | 0.62 (0.34–1.13), 0.116 | – | |
| Thorax—anterior | 0.60 (0.26–1.34), 0.228 | – | |
| Thorax—posterior | 0.70 (0.38–1.28), 0.241 | – | |
| Other | 0.57 (0.21–1.39), 0.237 | – | |
| Maximum abscess diameter (cm), mean(s.d.) | – | 1.02 (0.96–1.09), 0.477 | – |
| Presence of cellulitis | No | Reference | Reference |
| Yes | 1.43 (1.01–2.00), 0.042 | 1.37 (0.96–1.94), 0.083 | |
| Timing of hospital presentation | Daytime (08.00–16.59) | Reference | – |
| Evening (17.00–21.59) | 0.77 (0.48–1.20), 0.265 | – | |
| Night (22.00–07.59) | 0.96 (0.54–1.61), 0.881 | – | |
| Timing of surgery | First hospital presentation | Reference | – |
| Planned return presentation | 0.90 (0.63–1.27), 0.560 | – | |
| Surgical setting | Operating room | Reference | – |
| Emergency department | 0.50 (0.03–2.63), 0.506 | – | |
| Ward/treatment area | 1.06 (0.74–1.50), 0.762 | – | |
| Primary operator | Consultant | Reference | – |
| Junior surgical trainee | 0.65 (0.33–1.35), 0.221 | – | |
| Nurse practitioner | 0.65 (0.22–1.79), 0.412 | – | |
| Senior surgical trainee | 0.68 (0.35–1.39), 0.261 | – | |
| Abscess packed | No | Reference | – |
| Yes | 0.80 (0.52–1.24), 0.304 | – |
Analyses performed on cases without any missing data (n = 1047). Junior surgical trainee relates to postgraduate year 1–4 or junior clinical fellow and senior surgical trainee relates to postgraduate year 5–10 or senior clinical fellow.