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Table 1 30-day readmission according to baseline characteristics among older patients discharged early from hospitals

From: Readmission of older acutely admitted medical patients after short-term admissions in Denmark: a nationwide cohort study

 Total Cohort1ReadmittedTime to readmission, days, median (IQR)Unchanged diagnosis2
Median age, years (IQR)75 (69-82)75 (70-82)
Age groups (years)
 65-7544,467 (47.7%)19.7%8 (3-16)30.8%
 76-8532,767 (35.1%)21.1%8 (3-17)23.8%
 86+16,072 (17.2%)20.4%8 (3-16)22.1%
Sex, n(%)
 Male46,196 (49.5%)22.2%8 (3-16)27.5%
 Female47,110 (50.5%)18.5%8 (3-16)25.9%
Charlson Comorbidity Index
 034,672 (37.2%)14.1%7 (2-15)30.2%
 1-236,421 (39.0%)20.4%8 (3-16)26.6%
 3+22,213 (23.8%)30.0%8 (3-17)24.4%
Marital Status
 Married46,965 (50.3%)20.5%8 (3-6)28.5%
 Not Married46,330 (49.7%)20.1%8 (3-16)25.0%
 Unknown11 (0.01%)0.0%
Diseases of the cardiovascular system13,038 (13.9%)19.1%9 (4-17)45.3%
 Angina Pectoris1901 (2.0%)17.7%10 (4-18)33.0%
 Atrial fibrillation7187 (7.7%)19.3%10 (4-18)59.3%
 Deep vein thrombosis1324 (1.4%)15.6%6 (2-13)16.4%
 Hypertension1622 (1.7%)15.7%7 (3-18)21.7%
 Heart failure1004 (1.1%)29.8%8 (3-16)34.1%
Diseases of the respiratory system3653 (3.9%)29.4%9 (3-17)37.8%
 COPD3088 (3.3%)29.0%9 (3-17)42.4%
 Respiratory failure565 (0.6%)31.5%10 (2-18)14.6%
Diseases of the nervous system2091 (2.2%)12.2%7 (2-17)26.8%
 TIA1441 (1.5%)10.6%6 (1-15)24.2%
 Epilepsy650 (0.7%)15.7%11 (2-20)29.4%
Endocrine and nutritional diseases2765 (3.0%)24.9%7 (2-15)21.5%
 Diabetes598 (0.6%)22.4%8 (2-17)19.4%
 Dehydration2167 (2.3%)25.5%7 (3-14)22.1%
Diseases of the digestive system1962 (2.2%)23.4%6 (2-14)19.4%
 Dyspepsia358 (0.4%)15.6%7.5 (3-14.5)7.1%
 Esophagitis53 (0.1%)17.0%5 (1-14)22.2%
 Constipation1502 (1.6%)25.7%5.5 (2-14)21.5%
 Ulcer without bleeding49 (0.1%)16.3%4.5 (2-11)0%
Hematological diseases
 Anemia4168 (4.5%)32.8%12 (6-20)42.5%
Infectious disease7600 (8.1%)23.2%6 (2-14)22.7%
 Erysipelas769 (0.8%)21.9%7 (3-17)31.6%
 Gastroenteritis652 (0.7%)21.8%4 (1-13)15.5%
 Pneumonia2711 (2.9%)23.5%6 (2-14)28.7%
 Urinary Tract Infection3468 (3.7%)23.6%6 (2-14)17.3%
Spinal disease/arthritis1194 (1.3%)17.7%6 (3-13)15.6%
 Back Pain1028 (1.1%)19.0%6 (2-12)16.4%
 Arthritis166 (0.2%)10.2%7 (4-21)5.9%
Mental and behavioral disorders
 Misuse of drugs or alcohol1078 (1.2%)17.2%8 (2-15)16.2%
R-diagnoses327,875 (29.8%)21.4%7 (3-15)22.7%
 Chest pain4157 (4.5%)15.8%9 (4-19)18.2%
 Dyspnea2450 (2.6%)26.7%8 (3-15)18.7%
 Fever688 (0.7%)32.4%5 (2-14)17.5%
 Headache569 (0.6%)15.6%9 (4-19)5.6%
 Pains in neuromuscular system1035 (1.1%)16.3%7 (2-15)6.5%
 Abdominal pain4920 (5.3%)21.6%6 (2-14)24.9
 Other pain1247 (1.3%)22.1%7 (2.5-15)11.2%
 Vertigo1986 (2.1%)14.5%7 (3-15)16.0%
 Other R-diagnoses10,823 (11.6%)23.5%7 (2-15)28.2%
Z-diagnoses424,392 (26.1%)17.1%8 (3-17)18.9%
 Malignancy1526 (1.6%)28.4%10 (4-17)18.4%
 Central-nervous diseases1841 (2.0%)13.4%7 (2-17)8.5%
 Heart diseases3297 (3.5%)15.8%6 (1-14)10.1%
 Myocardial infarction5705 (6.1%)14.3%10 (4-18)21.0%
 Rehabilitation8037 (8.6%)18.1%7 (2-16)25.0%
 Other Z-diagnoses3986 (4.3%)17.7%7 (2-16)8.4%
  1. COPD chronic obstructive pulmonary disease. IQR Interquartile range. TIA Transient ischaemic attack. 1Values reported are numbers (percentages of total cohort), unless otherwise stated
  2. 2Proportion of patients with readmission discharge diagnosis that did not differ from the diagnosis for the index discharge diagnosis. 3Used if symptoms, signs and abnormal clinical and laboratory findings are not elsewhere classified. 4Used when a diagnosis has not yet been confirmed