Table 5. Postoperative mortality and complications associated with additional coexisting diseases in surgical patients with preoperative regular dialysis.

	Number of co-existing diseases*
	0		1		2		3		4
	OR	(95% CI)	OR	(95% CI)	OR	(95% CI)	OR	(95% CI)	OR	(95% CI)
Postoperative 30-day mortality	1.00	(reference)	0.82	(0.38–1.76)	1.24	(0.62–2.48)	0.94	(0.46–1.91)	1.47	(0.75–2.89)
Postoperative 30-day complications
Acute myocardial infarction	1.00	(reference)		NA‡		NA‡		NA‡		NA‡
Deep wound infection	1.00	(reference)		NA‡		NA‡		NA‡		NA‡
Pneumonia	1.00	(reference)	0.73	(0.46–1.15)	0.70	(0.45–1.08)	1.04	(0.69–1.58)	1.35	(0.91–2.02)
Postoperative bleeding	1.00	(reference)	1.66	(0.96–2.86)	2.04	(1.20–3.46)	1.61	(0.94–2.77)	2.12	(1.25–3.58)
Septicemia	1.00	(reference)	1.40	(0.89–2.20)	1.56	(1.01–2.40)	1.90	(1.24–2.91)	2.63	(1.73–3.99)
Stroke	1.00	(reference)	1.26	(0.74–2.15)	1.45	(0.87–2.40)	2.27	(1.38–3.74)	2.83	(1.74–4.60)
Any of above	1.00	(reference)	1.30	(0.98–1.72)	1.42	(1.08–1.86)	1.87	(1.43–2.44)	2.61	(2.01–3.39)
Increased length of stay†	1.00	(reference)	1.12	(0.84–1.48)	1.26	(0.96–1.65)	1.66	(1.27–2.17)	2.59	(2.00–3.36)
ICU stay	1.00	(reference)	0.90	(0.72–1.13)	0.99	(0.80–1.23)	1.21	(0.97–1.50)	1.54	(1.25–1.91)
Elevated medical expenditure	1.00	(reference)	1.12	(0.89–1.41)	1.08	(0.86–1.36)	1.32	(1.05–1.65)	1.83	(1.47–2.28)

^*Adjusted for age, sex, teaching hospital, coexisting disease and types of surgery and anesthesia.

^†The highest quintile of length of stay during the surgical admission (patient percentage for each group belonging to the highest quintile of length of stay [≥18 days] of the total patients as percentage of increased length of stay).

^‡NA, Not available due to small sample size.

OR, odds ratio; CI, confidence interval; ICU, intensive care unit; NA, not available.