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Table 1 Description of variables

From: Could the clinical interpretability of subgroups detected using clustering methods be improved by using a novel two-stage approach?

  Response options Missing-ness
Demographics domain   
Age Years of age 0 %
Gender Female/male 0 %
Previous history domain   
Risk factors for cardiovascular disease sum score of hypercholesterolemia, hypertension, diabetes, family history of cardiac disease, previous or current smoking (all scored yes/no) 0 to 5 0 %
Psychological domain (patient perception and coping)   
Does the pain originate from the heart? Yes/possibly/no 0.4 %
Does the pain originate from the muscles and joints? Yes/possibly/no 0.2 %
Are you afraid? Yes/no 0.2 %
Pain domain   
Average chest pain episode duration <10 min/10 min-1 hour/> 1 hour/continuous 21.9 %
Pain description ‘crushing pain’ Yes/no 0 %
Pain description ‘tenderness’ Yes/no 0 %
Pain description ‘sharp pains’ Yes/no 0 %
Pain description ‘well defined’ Yes/no 0 %
Pain description ‘diffuse’ Yes/no 0 %
Pain description ‘burning’ Yes/no 0 %
Pain description ‘tingling’ Yes/no 0 %
Activity limitation domain   
SF36 physical function sum score 0 to 100 scale (high scores better) 3.5 %
Diagnostic classification domain   
Danish Cardiologist’s Society classification ‘angina’ No angina/typical/atypical/uncharacteristic/ unstable 0.2 %
Canadian Cardiovascular Society classification Grades 0 to 3 1.6 %
Palpation domain   
Anterior   
Springing - tenderness sterno/xiphoid junction Yes/no <1 %
Springing - tenderness costosternal 2–3 right Yes/no <1 %
Springing - tenderness costosternal 2–3 left Yes/no <1 %
Springing - tenderness costosternal 3–4 right Yes/no <1 %
Springing - tenderness costosternal 3–4 left Yes/no <1 %
Springing - tenderness costosternal 4–5 right Yes/no <1 %
Springing - tenderness costosternal 4–5 left Yes/no <1 %
Springing - tenderness costosternal 5–6 right Yes/no <1 %
Springing - tenderness costosternal 5–6 left Yes/no <1 %
Springing - provoked pain sterno/xiphoid junction Yes/no <1 %
Springing - provoked pain costosternal 2–3 right Yes/no <1 %
Springing - provoked pain costosternal 2–3 left Yes/no <1 %
Springing - provoked pain costosternal 3–4 right Yes/no <1 %
Springing - provoked pain costosternal 3–4 left Yes/no <1 %
Springing - provoked pain costosternal 4–5 right Yes/no <1 %
Springing - provoked pain costosternal 4–5 left Yes/no <1 %
Springing - provoked pain costosternal 5–6 right Yes/no <1 %
Springing - provoked pain costosternal 5–6 left Yes/no <1 %
Muscle tenderness/pain pectoralis maj. left No tenderness/tenderness/pain <1 %
Muscle tenderness/pain pectoralis min. left No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 2–3 left No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 3–4 left No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 4–5 left No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 5–6 left No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 6–7 left No tenderness/tenderness/pain <1 %
Muscle tenderness/pain pectoralis maj. right No tenderness/tenderness/pain <1 %
Muscle tenderness/pain pectoralis min. right No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 2–3 right No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 3–4 right No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 4–5 right No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 5–6 right No tenderness/tenderness/pain <1 %
Muscle tenderness/pain intercostalis 6–7 right No tenderness/tenderness/pain <1 %
Posterior   
Tender c4-5 paraspinalpost either left or right Yes/no 1 %
Tender c5-6 paraspinalpost either left or right Yes/no 1 %
Tender c6-7 paraspinalpost either left or right Yes/no 1 %
Tender c7-th1 paraspinalpost left or right Yes/no 1 %
Tender th1-2 paraspinalpost left or right Yes/no 1 %
Tender th2-3 paraspinalpost left or right Yes/no 1 %
Tender th3-4 paraspinalpost left or right Yes/no 1 %
Tender th4-5 paraspinalpost left or right Yes/no 1 %
Tender th5-6 paraspinalpost left or right Yes/no 1 %
Tender th6-7 paraspinalpost left or right Yes/no 1 %
Tender th7-8 paraspinalpost left or right Yes/no 1 %
Tender th8-9 paraspinalpost left or right Yes/no 1 %
Vertebral springing th1-2 Yes/no 1 %
Vertebral springing th2-3 Yes/no 1 %
Vertebral springing th3-4 Yes/no 1 %
Vertebral springing th4-5 Yes/no 1 %
Vertebral springing th5-6 Yes/no 1 %
Vertebral springing th6-7 Yes/no 1 %
Vertebral springing th7-8 Yes/no 1 %
Vertebral springing th8-9 Yes/no 1 %