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Table 1 Elderly patients visiting emergency department for medical illnesses during the study period

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

Characteristics Total With thrombocytopenia Without thrombocytopenia p value
Demographic features
 Age (years) 80.7 ± 8.2 78.5 ± 9.1 81.3 ± 7.8 0.1
 Gender (male %) 68 (50) 16 (52) 52 (50) 0.84
Comorbidities
 Diabetes mellitus (%) 53 (39) 14 (45) 39 (37) 0.43
 Hypertension (%) 78 (57) 11 (35) 67 (64) <0.01
 Heart failure (%) 23 (17) 4 (13) 19 (18) 0.5
 Coronary artery disease (%) 11 (8) 2 (6) 9 (9) 0.71
 Peripheral artery occlusive disease (%) 9 (7) 3 (10) 6 (6) 0.44
 Chronic obstructive pulmonary disease (%) 15 (11) 2 (6) 13 (12) 0.36
 Chronic kidney disease (%) 54 (40) 14 (45) 40 (38) 0.48
 Previous or active malignancy (%) 35 (26) 8 (26) 27 (26) 0.99
 Peptic ulcer disease (%) 12 (9) 2 (6) 10 (10) 0.6
 Charlson comorbidity index 7 (6–9) 7 (5–9) 8 (6–9) 0.1
Initial impression (%)     0.23
 Cardio- or cerebro-vascular events 11 (8) 3 (10) 8 (8)  
 Pulmonary diseases 63 (46) 10 (32) 53 (50)  
 Gastrointestinal and hepatic diseases 21 (15) 9 (29) 12 (11)  
 Renal diseases 14 (10) 3 (10) 11 (10)  
 Infection of unknown origin 11 (8) 3 (10) 8 (8)  
 Miscellaneous 16 (12) 3 (10) 13 (12)  
First vital signs obtained on ED evaluation
 Systolic blood pressure (mmHg) 131 (110.3–153) 133 (101–146) 130 (112–154) 0.89
 Diastolic blood pressure (mmHg) 73 (62–84) 71 (60–82) 73 (62–84) 0.73
 Heart rate (/min) 96.7 ± 20.8 96.8 ± 27.1 96.7 ± 18.7 0.98
 Body temperature (°C) 37.2 ± 1.2 37.2 ± 1.2 37.3 ± 1.1 0.77
 Respiratory rate (/min) 20 (18–22) 18 (18–22) 20 (18–22) 0.88
First laboratory data on ED
 Leukocyte counts (K/μL) 11.4 (7.9–15.6) 8.2 (4.9–12.3) 12 (8.4–16.5) < 0.01
 Hemoglobin (g/dL) 11.4 (9.6–12.8) 11.3 (8.8–12.4) 11.6 (9.6–13.1) 0.47
 Platelet counts (K/μL) 225 ± 102 102 ± 51 262 ± 82 < 0.01
 Baseline eGFR (ml/min/1.73 m2) 70.3 (42.7–88) 68.9 (39.3–84.4) 70.3 (42.7–89.8) 0.46
 Serum creatinine on ward admission (mg/dL) 1.1 (0.7–1.9) 1.5 (0.9–2.1) 1 (0.7–1.7) 0.1
 ED length of stay (days) 4.5 (3–6) 4 (3–6) 5 (3–6) 0.64
  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: ED emergency department, eGFR estimated glomerular filtration rate