Skip to main content
. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: J Am Geriatr Soc. 2011 Dec;59(12):2306–2313. doi: 10.1111/j.1532-5415.2011.03725.x

Table 3.

Comparison of Predisposing Factors for Delirium after Hip Fracture Repair by Pre-Operative Dementia Status

No Dementia (N = 284) Probable Dementia (N =141)
Variables Crude OR (95% CI) p-value Crude OR (95% CI) p-value
age –in years 1.07 (1.05, 1.08) 0.020 1.00 (0.93, 1.07) 0.843
gender - male 2.06 (1.16, 3.63) 0.012 1.85 (0.85, 4.02) 0.119
race - white 0.89 (0.23, 3.44) 0.708 0.54 (0.39, 5.93) 0.413
current smoking 0.55 (0.25, 1.25) 0.198 1.39 (0.54, 3.61) 0.486
current alcohol use 0.59 (0.23, 1.48) 0.399 1.86 (0.61, 5, 69) 0.293
body-mass index-bmi (kg/m2) 0.93 (0.88, 0.99) 0.025 1.06 (0.98, 1.14) 0.151
 underweight: bmi <18.50 1.23 (0.52, 2.90) 0.638 0.86 (0.29, 2.56) 0.781
 normal: 18.50≤ bmi < 25.00 REF N/A REF N/A
 overweight: bmi ≥ 25.00 0.63 (0.34, 1.19) 0.152 1.48 (0.61, 3.58) 0.382
pre-operative MMSE 0.77 (0.60, 0.99) 0.039 0.93 (0.83, 1.05) 0.274
Katz ADL index 0.74 (0.52, 1.06) 0.098 0.90 (0.69, 1.17) 0.422
Lawton IADL scale 0.89 (0.76, 1.03) 0.123 0.99 (0.84, 1.17) 0.916
Medical History
# of medical comorbidities 1.14 (1.03, 1.27) 0.023 1.09( 0.95, 1.25) 0.201
CVA or TIA 1.15 (0.77, 3.03) 0.225 1.22 (0.57, 2.59) 0.613
# of prescription meds 1.32 (1.02, 1.70) 0.034 0.95 (0.74, 1.20) 0.651
ASA rating 4 or above 2.45 (1.12, 5.25) 0.022 1.30 (0.54, 3.14) 0.555
history of depression 1.13 (0.53, 2.39) 0.758 0.98 (0.43, 2.26) 0.919
Pre-operative variables
Type of fracture
 femoral neck REF N/A REF N/A
 Intertrochanteric 0.87 (0.51.1.49) 0.621 0.99 (0.51.1.94) 0.994
Pre-op serological abnormality
 hematocrit <30 1.52 (0.65, 3.56) 0.328 0.72 (0.23, 2.26) 0.573
 bun/creatinine >20 0.71 (0.41, 1.22) 0.211 0.97 (0.47, 1.99) 0.932
 WBC>12,000 0.74 (0.39, 1.40) 0.200 1.03 (0.51, 2.08) 0.936
 sodium <130 2.25 (0.87, 5.83) 0.088 1.16 (0.25, 5.41) 0.846
 albumin <3.5 or >4.5 1.30 (0.71, 3.72) 0.246 1.48 (0.60, 3.65) 0.396
ER to surgery – in hours 1.00 (0.99, 1.02) 0.417 1.01 (1.00, 1.03) 0.042
ER to surgery > 36 hours 0.81 (0.42, 1.58) 0.536 2.83 (1.24, 6.48) 0.017
Intraoperative Variables
Type of surgery
 Hemiarthroplasty REF N/A REF N/A
 Screw and side plate 0.84 (0.35, 2.05) 0.710 0.84 (0.35, 2.06) 0.710
 Intramedullary hip screw 0.39 (0.18, 0.94) 0.034 0.72 (0.28, 1.90) 0.509
 Cannulated screw 0.56 (0.14, 1.09) 0.072 1.72 (0.54, 5,56) 0.359
 Others 0.70 (0.21, 2.28) 0.548 0.47 (0.10, 2.16) 0.334
Type of anesthesia –general 1.40 (0.79, 2.48) 0.254 1.15 (0.58, 2.25) 0.692
Length of surgery – hours, (sd) 1.36 (1.03, 1.79) 0.030 0.98 (0.69, 1.42) 0.919
Length of surgery >2 hours 1.99 (1.14, 3.47) 0.017 1.02 (0.52, 1.98) 0.960
Transfusion >2 units of RBC 2.60 (1.33, 5.08) 0.004 0.98 (0.40, 2.41) 0.965