Table 1

Exploratory characteristics for post hoc analysis

Characteristics	Time of administration	Type of quantity
Demographic
Age, height, weight	Baseline	Continuous
Marital, educational, occupational status, nursing home	Baseline	Categorical
Use of social services, smoking	Baseline	Binary (Y/N)
Clinical and paraclinical
FEV₁	Baseline	Continuous
MRC, BMI, CAT	Baseline	Categorical/ordinal
Oxygen treatment	Baseline	Binary (Y/N)
Days treated with NIV within 12 month	Baseline	Continuous
Days in intensive care within 12 month	Baseline	Continuous
Number of admissions within 12 month	Baseline	Continuous
LOS within 12 month	Baseline	Continuous
Medications
SSRI, TCA, azapirones	Baseline	Binary (Y/N)
Opioids, benzodiazepines	Baseline	Binary (Y/N)
Comorbidities
Chronic heart failure, diabetes mellitus, cancer, osteoporosis	Baseline	Binary (Y/N)
Usual care
Pulmonary rehabilitation during the past 12 month	Baseline	Binary (Y/N)
Dialogues with a respiratory nurse during the past 12 month	Baseline	Binary (Y/N)
Public appropriation for terminal care	Baseline	Binary (Y/N)
Number of emergency calls during the past 12 month	Baseline	Continuous
Number of contacts with help line 1813* during the past 12 month	Baseline	Continuous
Questionnaires
HADS, CRQ, SGRQ	Baseline	Continuous

*Helpline 1813 offers advice and guidance when a general practitioner cannot be contacted and is part of the Danish prehospitalisation emergency services.
BMI, body mass index; CAT, The COPD Assessment Test (CAT); CRQ, Chronic Respiratory Disease Questionnaire; FEV₁, forced expiratory volume in 1 s; HADS, Hospital and Anxiety and Depression Scale; LOS, length of stay; MRC, Medical Research Council dyspnoea scale; NIV, non-invasive ventilation; SGRQ, St. George’s Respiratory Questionnaire; SSRI, selective serotonin reuptake inhibitors; TCA, tricyclic antidepressants; Y/N, yes/no.