Table 2.

Associations between abscess recurrence or fistula formation within one year of I&D of anorectal abscess.

Variable	Hazard ratio	95% CI	p value
Age	1.01	1.010–1.015	<0.0001
BMI	1.00	0.967–1.044	0.80
CCI	0.85	0.687–1.056	0.14
Abscess location; ref, perianal
Ischiorectal	1.61	1.029–2.522	0.04
Intersphincteric	1.34	0.913–1.979	0.13
Horseshoe	0.80	0.159–4.009	0.79
Drainage location; ref, bedside	0.20	0.114–0.367	<0.0001
Wound care; ref, packing
Drain	1.09	0.821–1.444	0.55
Nothing	0.63	0.406–0.978	0.04

CI: confidence interval; BMI: body mass index; CCI: Charlson comorbidity index; ref: value of reference.