37 Prolonged length of stay of older patients in the ED CHAPTER 2 Table 5 Multivariable analysis: independent risk factors for a prolonged LOS (LOS > 293 minutes) at the ED*. 95% CI Odds Ratio Standard Error Lower Upper p-value Patient characteristics Age, per year increase 1.0 0.0096 0.98 1.0 0.66 Female sex (ref = male) 1.1 0.13 0.85 1.4 0.56 Polypharmacy 1.1 0.14 0.84 1.4 0.56 Organizational factors Presentation on weekend (ref = midweek) 0.75 0.11 0.57 1.0 0.051 Time of presentation (ref = morning) Night (00.00 - 6.59) 0.66 0.18 0.39 1.1 0.13 Afternoon (12.00 - 17.59) 1.2 0.19 0.89 1.6 0.23 Evening (18.00 - 23.59) 0.85 0.15 0.59 1.2 0.37 Number of consultations, per 1 consultation increase 2.4 0.22 2.0 2.9 <0.001 Number of diagnostic interventions, per additional intervention 1.5 0.080 1.4 1.7 <0.001 Assigned urgency (ref = U0) U1 - U2 4.8 1.9 2.2 10 <0.001 U3 - U4 6.3 2.5 2.9 14 <0.001 U5 or missing 2.9 1.3 1.2 6.8 0.016 Clinical factors Presenting complaint (ref = trauma) High energetic trauma 3.1 2.4 0.71 14 0.13 Resuscitation 9.8 18 0.27 356 0.21 Neurological 2.2 0.81 1.0 4.5 0.038 Internal medicine 2.6 0.77 1.4 4.6 0.002 Altered consciousness: collaps or confused 3.3 1.2 1.6 6.6 0.001 Squealae of medical procedure 1.7 0.72 0.71 3.9 0.25 Other than above 3.3 1.6 1.3 8.4 0.015 Treating specialty (ref = emergency physician) Surgery 3.4 0.75 2.2 5.2 <0.001 Internal medicine 2.6 0.46 1.9 3.7 <0.001 Geriatrics 0.66 0.25 0.32 1.4 0.26 Pulmonology 2.2 0.54 1.4 3.6 <0.001 Neurology 1.5 0.34 0.98 2.3 0.064 Other than above 1.0 0.30 0.57 1.8 0.96 *Area under the receiver operating characteristic curve = 0.79; Pseudo R2, 0.18. LOS= Length of stay, ED= Emergency department.
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