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Clinical Epidemiology Volume 12, 2020 - Issue
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Original Research

The Risk of Selection Bias in a Clinical Multi-Center Cohort Study. Results from the Norwegian Cognitive Impairment After Stroke (Nor-COAST) Study

Karen Rosmo Kuvås1 Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, NTNU-Norwegian University of Science and Technology, Trondheim, NorwayORCID Iconhttps://orcid.org/0000-0001-6616-9130
ORCID Icon,
Ingvild Saltvedt1 Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, NTNU-Norwegian University of Science and Technology, Trondheim, Norway;2 Department of Geriatrics, Clinic of Medicine, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
,
Stina Aam1 Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, NTNU-Norwegian University of Science and Technology, Trondheim, Norway;2 Department of Geriatrics, Clinic of Medicine, St. Olavs Hospital, Trondheim University Hospital, Trondheim, NorwayORCID Iconhttps://orcid.org/0000-0002-9116-6991
ORCID Icon,
Pernille Thingstad1 Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, NTNU-Norwegian University of Science and Technology, Trondheim, Norway;3 Department of Health and Social Services, City of Trondheim, Trondheim, Norway
,
Hanne Ellekjær1 Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, NTNU-Norwegian University of Science and Technology, Trondheim, Norway;4 Department of Stroke, Clinic of Medicine, St Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
&
Torunn Askim1 Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, NTNU-Norwegian University of Science and Technology, Trondheim, Norway;4 Department of Stroke, Clinic of Medicine, St Olavs Hospital, Trondheim University Hospital, Trondheim, NorwayCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-9818-9272
ORCID Icon
Pages 1327-1336 | Published online: 01 Dec 2020

Figures & data

Figure 1 Flow-chart showing reasons for not being eligible and not being included in Nor-COAST.

Figure 1 Flow-chart showing reasons for not being eligible and not being included in Nor-COAST.

Table 1 Proportion of Patients from the Participating Health Authorities

Table 2 Characteristics of Participants Versus Non-Participants in Nor-COAST

Table 3 Characteristics of Participants Versus Non-Participants Within Each Health Authority

Figure 2 The proportion of patients with mild (National Institutes of Health Stroke Scale 0–4) versus moderate/severe (National Institutes of Health Stroke Scale > 4) stroke among participants and non-participants within different age-groups.

Figure 2 The proportion of patients with mild (National Institutes of Health Stroke Scale 0–4) versus moderate/severe (National Institutes of Health Stroke Scale > 4) stroke among participants and non-participants within different age-groups.

Table 4 Binary Logistic Regression Analysis Showing the Odds Ratio (OR) and 95% Confidence Interval (CI) for Being Included in Nor-COAST According to Baseline Characteristics

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