Table 2 Impact of adverse outcomes, regardless of time of occurrence, on overall patient evaluation, dissatisfaction and need for improvement in care (Leiden University Medical Center, 1876 surgical patient admissions during 2003).

	Overall patient evaluation	Dissatisfaction	Improvement needed
	B (95% CI)	Odds ratio (95% CI)	Odds ratio (95% CI)
Adverse outcomes (yes/no)	−0.149 (−0.276 to −0.022)*	2.01 (1.31 to 3.10)*	1.22 (1.00 to 1.48)*
Age (years)	0.005 (0.002 to 0.009)*	1.00 (0.99 to 1.01)	1.00 (0.99 to 1.00)
Gender (women/men)	−0.038 (−0.158 to 0.082)	1.45 (0.95 to 2.21)	1.18 (0.98 to 1.42)
ASA class 1–2†	0.275 (0.128 to 0.421)*	0.37 (0.23 to 0.59)*	1.17 (0.94 to 1.47)
ASA class 3–5†	0.170 (−0.028 to 0.368)	0.50 (0.27 to 0.94)*	0.94 (0.69 to 1.29)
ASA class missing†	0.503 (0.188 to 0.817)*	0.12 (0.02 to 0.89)*	0.93 (0.57 to 1.52)
Model fit	Adjusted R2  = 0.01	Nagelkerke R2  = 0.048	Nagelkerke R2  = 0.01

ASA, American Society of Anaesthesiologists.

*Differences significant in the regression analyses (p⩽0.05).

†Reference category: patients without operation