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Table 2 Comparison of elderly patients with and without AKI after emergency department stay

From: Thrombocytopenia on the first day of emergency department visit predicts higher risk of acute kidney injury among elderly patients

Characteristics AKI after ED stay No AKI after ED stay p value
Demographic features
 Age (years) 79.6 ± 8.4 81.5 ± 7.9 0.19
 Gender (male %) 33 (58) 35 (44) 0.12
 Comorbidities
 Diabetes mellitus (%) 28 (49) 25 (32) 0.04
 Hypertension (%) 28 (49) 50 (63) 0.1
 Heart failure (%) 12 (21) 11 (14) 0.28
 Coronary artery disease (%) 4 (7) 7 (9) 0.7
 Peripheral artery occlusive disease (%) 3 (5) 6 (8) 0.59
 Chronic obstructive pulmonary disease (%) 7 (12) 8 (10) 0.7
 Chronic kidney disease (%) 31 (54) 23 (29) < 0.01
 Previous or active malignancy (%) 18 (32) 17 (22) 0.19
 Peptic ulcer disease (%) 7 (12) 5 (6) 0.23
 Charlson comorbidity index 8 (6–10) 7 (6–8) 0.02
Initial impression (%)    < 0.01
 Cardio- or cerebro-vascular events 2 (4) 9 (11)  
 Pulmonary diseases 23 (40) 40 (51)  
 Gastrointestinal and hepatic diseases 13 (23) 8 (10)  
 Renal diseases 11 (19) 3 (4)  
 Infection of unknown origin 2 (4) 9 (11)  
 Miscellaneous 6 (11) 10 (13)  
First vital signs obtained on ED evaluation
 Systolic blood pressure (mmHg) 114 (95–141) 144 (123–162) < 0.01
 Diastolic blood pressure (mmHg) 64 (54–75) 78 (69–90) < 0.01
 Heart rate (/min) 94.5 ± 23.3 98.3 ± 18.8 0.3
 Body temperature (°C) 37 ± 1.3 37.4 ± 1.1 0.06
 Respiratory rate (/min) 19 (18–21) 20 (18–22) 0.69
First laboratory data on ED
 Leukocyte counts (K/μL) 12.3 (7.7–16.2) 10.6 (8–14.6) 0.12
 Hemoglobin (g/dL) 9,7 (7.9–12) 11.7 (10.5–13.1) 0.06
 Platelet counts (K/μL) 200 ± 100 243 ± 100 0.01
 Baseline eGFR (ml/min/1.73 m2) 58.8 (33.5–83.8) 76.5 (51.1–91) < 0.01
 Serum creatinine on ward admission (mg/dL) 1.9 (1.4–2.5) 0.8 (0.6–1.1) < 0.01
 ED length of stay (days) 4 (3–5) 5 (3–6) 0.19
  1. Data are expressed as mean ± standard deviation or median with 25% and 75% quartiles for continuous variables, and number (percentage) for categorical variables
  2. Abbreviation: AKI acute kidney injury, ED emergency department, eGFR estimated glomerular filtration rate