. Author manuscript; available in PMC: 2015 Aug 7.

Published in final edited form as: J Am Geriatr Soc. 2013 Mar;61(3):365–370. doi: 10.1111/jgs.12143

Table 2.

Descriptive statistics and bivariate analyses. A logistic model was used to assess effects against onset of delirium on the first postoperative day.

	Delirium	No Delirium	P-Value	Odds Ratio (95% CI)
Age
<75	64 (46.7)	228 (68.1)	-	-
>=75	73 (53.3)	107 (31.9)	<.01	1.78 (1.25, 2.54)

Gender
Female	86 (62.8)	140 (41.8)	-	-
Male	51 (37.2)	195 (58.2)	<.01	.54 (.38, .76)

History of CNS Disorder
Yes	81 (59.1)	140 (41.8)	-	-
No	56 (40.9)	195 (58.2)	<.01	1.89 (1.33, 2.69)

History of Chronic Narcotic Use
Yes	89 (65.0)	244 (72.8)	-	-
No	48 (35.0)	91 (27.2)	.06	1.41 (.98, 2.03)

History of Alcohol Use
Yes	72 (52.6)	138 (41,2)	-	-
No	65 (47.4)	197 (58.8)	.04	.69 (.49, .98)

Preoperative TICS Score
<35	113 (82.5)	219 (65.4)	-	-
>=35	24 (17.5)	116 (34.6)	<.01	.47 (.30, .71)

Preoperative Pain Score
0 – 4	97 (70.8)	276 (82.3)	-	-
4+	40 (29.2)	59 (17.6)	<.01	1.74 (1,16, 2.58)

Preoperative Hemoglobin
>=13	59 (43.1)	193 (57.8)	-	-
<13	78 (56.9)	142 (42.3)	<.01	1.88 (1.31, 2.70)

Preoperative Creatinine
<=1.3	115 (83.9)	293 (87.4)	-	-
>1.3	22 (16.1)	42 (12.5)	.51	1.19 (.69, 2.01)

Surgery Risk
1–2	98 (71.5)	283 (84.5)	-	-
3	39 (28.5)	52 (15.5)	<.01	1.87 (1.23, 2.82)

ASA Class
1 or 2	57 (41.6)	158 (47.2)	-	-
3 or 4	80 (58.4)	177 (52.8)	.08	1.37 (.97, 1.94)

Anesthesia Duration
<=3 hours	25 (18.2)	68 (20.3)	-	-
>3 hours	112 (81.8)	267 (79.7)	.40	1.22 (.78, 1.96)

Blood Loss (per 500)	850.8 (1191)	617.5 (1224)	.05	1.07 (1.00, 1.15)

Blood Transfusion
0 ml	78 (56.9)	246 (73.4)	-	-
<1000 ml	35 (25.5)	69 (20.6)	.03	1.60 (1.05, 2.41)
>=1000 ml	23 (17.5)	20 (6.0)	<.01	3.18 (1.82, 5.60)

Columns 1 and 2 report the count (%) except for blood loss which reports the mean (SD).

Abbreviations: TICS: Telephone Interview for Cognitive Status, ASA: American Society of Anesthesiologists