TABLE 3.

Risk Categories for Readmission for Dehydration after Ileostomy Formation

						Predicted risk
				Derivation sample	Validation sample	Derivation sample	Validation sample
Risk category		Points assignment		Risk (%)	Risk (%)	Risk % (95% CI)	Risk % (95% CI)
Lowest risk		0–2 points		4/545 (0.73)	1/217 (0.46)	1.12 (0.69–1.54)	0.76 (0.03–1.27)
Low risk		3–8 points		29/1692 (1.71)	10/727 (1.38)	1.93 (1.50–2.36)	1.35 (0.08–1.91)
Medium risk		9–14 points		86/3313 (2.60)	33/1435 (2.30)	2.67 (2.28–3.04)	2.20 (1.65–2.74)
High risk		15–23 points		106/2294 (4.62)	34/990 (3.43)	4.20 (3.54–4.86)	4.11 (3.10–5.13)
Highest risk		24–39 points		12/220 (5.45)	7/98 (7.14)	7.01 (4.92–9.11)	5.53 (2.63–8.43)