Table 2.

Association of postoperative AChE / BuChE activity with POD: n = 127 versus n = 108

	OR (CI 95%)	p-value	R2
AChE activity postop. (U/gHb) (n = 108)	0.930 (0.867–0.998)	0.044	0.216
AChE activity postop. (U/gHb) (n = 127)	0.943 (0.890–1.000)	0.050	0.217
BuChE activity postop. (100 U/l) (n = 108)	0.988 (0.936–1.043)	0.663	0.172
BuChE activity postop. (100 U/l) (n = 127)	0.985 (0.937–1.036)	0.56	0.185

n = 108 patients (blood assessment exclusively on first postoperative day)

n = 127 patients (blood assessment in 85% on postoperative day 1 and in 15% on third postoperative day)

Dependent variable: POD, independent variables: postoperative AChE- or BuChE- activity, age, duration of surgery, CCI. OR odds ratio, CI confidence interval, R2 Nagelkerke’s pseudo measures, AChE acetylcholinesterase, BuChE butyrylcholinesterase, U Units, Hb hemoglobin, POD postoperative delirium, CCI Charlson Comorbidity Index