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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 %