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Table 3 Variables related to the initial hospitalisation and discharge

From: Risk factors for hospital readmission in older adults within 30 days of discharge – a comparative retrospective study

Variable Comparison group (n = 360) Readmitted
<  30 days (n = 360)
p-value
Emergent hospitalisation, % 88 93 0.058c
Hospitalisation related to cancer diagnosis, % 6.9 11 0.051c
Length of stay, Mean (SD) 6.9 (7.2) 7.8 (5.2) 0.063b
Length of stay 5 days or longer, % 53 66 < 0.001c
Laboratory and test results (last result before discharge)
 Plasma sodium level, mmol/L, Mean (SD) 140 (3.7) 139 (3.8) 0.267b, e
 Plasma potassium level, mmol/L, Mean (SD) 4.0 (0.4) 4.0 (0.4) 0.815b, e
 Blood haemoglobin level, g/L, Mean (SD) 124 (19.2) 119 (18.1) < 0.001b, e
 Relative eGFRa, Mean (SD) 59 (18.2) 55 (20.9) 0.006b, d
 Body Mass Index < 22, kg/m2, % 30 35 0.153c, f
Procedure performed during hospital stay
 Minor surgery/diagnostic procedure, % 33 37 0.241c
 Major surgery, % 31 21 0.002c
Variables concerning discharge
 Discharged Monday-Thursday, % 70 66 0.230c, d
 Discharged Friday or day before holiday, % 19 27 0.012c, d
 Discharged weekend or holiday, % 11 6.7 0.064c, d
 Discharged from Internal medicine, % 56 54 0.600c
 Discharged from General surgery, % 21 28 0.046c
 Discharged from Infection, % 7.2 6.1 0.550c
 Discharged from Orthopaedics, % 11 8.9 0.320c
 Discharged from Gynaecology/ENT unit, % 4.2 3.3 0.556c
  1. Abbreviations: ENT Ear Nose Throat, eGFR Estimated Glomerular Filtration Rate, SD Standard Deviation
  2. aVariables included in the Charlson Comorbidity Index bStudent’s t-test cχ2-test dInternal missing 0.4–1.7% eInternal missing 3.2–4.6% fInternal missing 13.5%
  3. Significant p-values are indicated in bold.