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Table 1 Variables studied

From: Reduction in inappropriate hospital use based on analysis of the causes

1 Number of Clinical Records
2 Age. Quantitative continuous variable, expressed in years.
3 Sex. Categorical variable.
4 Date of admission. This variable studies the month and day of the week of both admission and stays: Quantitative ordered variables.
5 Admission in holiday period. Qualitative variable. This variable considers an admission or stay during the summer holidays from July to September, Easter and the Spring Festival week, as well as the Christmas week and New Year.
6 Days of total stay in Hospital. Quantitative continuous variable.
7 Responsible clinical speciality: medical or surgical service responsible for the patient. Qualitative variable. These are grouped into Internal Medicine, Cardiology, Infectious Diseases, Haematology, Other Medical, General Surgery, Traumatology and Other Surgical.
8 Diagnosis. Refers to diagnosis on discharge of the patient coded according to the international standards of the ICD-9-CM Classification and DRG. Qualitative variable.
9 Type of admission. Categorical variable: programmed or emergency.
10 Origin of admission. Qualitative variable: emergencies, consultation, home or other hospital.
11 Hospital occupancy rate on day of admission studied. Quantitative continuous variable.
12 Hospital occupancy rate on day of stay studied. Quantitative continuous variable.
13 Number of patients admitted on day of admission studied. Quantitative continuous variable.
14 Nursing Unit where patient is located. Indicates whether the patient is in the corresponding ward or not (“outlying patient”). Qualitative variable.
15 Criteria met for appropriateness of admission, according to the AEP classification of reasons.
16 Criteria met for appropriateness of stay, according to the AEP classification of reasons. Cause of inappropriateness of admission when the admission is inappropriate.
17 Cause of inappropriateness of stay when the stay is inappropriate.
18 Cause of inappropriateness of admission when the admission in inappropriate.