Table 1.
Baseline Characteristics for 45,866 Patients Included in the Analysis of the Association between Hypothermia and Transfusion
| Factor | Area Under the 37°C Threshold - Quartile-Based Groups | |||
|---|---|---|---|---|
|
First Quartile ≤1.2°C·hr (N = 11,474) |
Second Quartile 1.2°C·hr – 2.2°C·hr (N = 11,461) |
Third Quartile 2.2°C·hr – 3.6°C·hr (N = 11,469) |
Fourth Quartile >3.6°C·hr (N = 11,462) |
|
| Outpatient Surgery | 26 | 19 | 10 | 3 |
| Estimated Blood Loss (cc) | 48 [10, 100] | 50 [20, 150] | 100 [50, 250] | 200 [100, 400] |
| Year of Surgery | 2009 [2007, 2011] | 2009 [2008, 2011] | 2009 [2007, 2011] | 2009 [2007, 2011] |
| Preoperative Hemoglobin (UNITS) | 13.5 [12.4, 14.5] | 13.7 [12.7, 14.7] | 13.8 [12.7, 14.8] | 13.8 [12.7, 14.8] |
| Preoperative Platelets (UNITS) | 255 [211, 306] | 247 [205, 295] | 245 [203, 290] | 240 [200, 287] |
| Duration of Surgery (min) | 137 [104, 191] | 168 [135, 219] | 212 [174, 266] | 289 [238, 355] |
| Body Mass Index (kg/m^2) | 28 [24, 34] | 28 [24, 33] | 28 [24, 32] | 27 [24, 32] |
| Age (years) | 53 [41, 64] | 56 [45, 67] | 58 [47, 68] | 60 [50, 69] |
| Elixhauser Comorbidities | ||||
| Congestive Heart Failure | 3 | 2 | 2 | 3 |
| Valvular Disease | 2 | 3 | 3 | 3 |
| Pulmonary Circulation Disorders | 1 | 1 | 1 | 1 |
| Peripheral Vascular Disease | 2 | 3 | 4 | 6 |
| Hypertension (Uncomplicated) | 38 | 40 | 43 | 45 |
| Hypertension (Complicated) | 3 | 3 | 3 | 4 |
| Paralysis | 1 | 1 | 1 | 1 |
| Other Neurological Disorders | 5 | 6 | 6 | 7 |
| Chronic Pulmonary Disease | 12 | 11 | 11 | 11 |
| Diabetes Without Chronic Complications | 13 | 12 | 13 | 11 |
| Diabetes With Chronic Complications | 2 | 2 | 2 | 2 |
| Hypothyroidism | 11 | 11 | 11 | 11 |
| Renal Failure | 4 | 3 | 4 | 5 |
| Liver Disease | 3 | 3 | 3 | 2 |
| Chronic Peptic Ulcer Disease | 0 | 0 | 0 | 0 |
| HIV and AIDS | 0 | 0 | 0 | 0 |
| Lymphoma | 1 | 1 | 1 | 1 |
| Metastatic Cancer | 5 | 5 | 5 | 6 |
| Solid Tumor Without Metastasis | 10 | 12 | 17 | 26 |
| Rheumatoid arthritis/Collagen Vascular Diseases | 3 | 3 | 2 | 3 |
| Coagulation Deficiency | 1 | 2 | 2 | 3 |
| Obesity | 20 | 17 | 17 | 15 |
| Weight Loss | 2 | 2 | 2 | 3 |
| Fluid and Electrolyte Disorders | 6 | 6 | 8 | 13 |
| Blood Loss Anemia | 1 | 1 | 1 | 2 |
| Deficiency Anemias | 6 | 5 | 5 | 6 |
| Alcohol Abuse | 1 | 1 | 1 | 1 |
| Drug Abuse | 0 | 0 | 0 | 1 |
| Psychoses | 2 | 2 | 2 | 2 |
| Depression | 12 | 11 | 11 | 9 |
AIDS = acquired immunodeficiency syndrome; HIV = human immunodeficiency virus infection.
Summary statistics presented as either a percentage or median [first and third quartiles].