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Table 2 Saturation of symptom concepts

From: Development of the chronic obstructive pulmonary disease morning symptom diary (COPD-MSD)

  Core Symptom Concepts Additional Symptom Conceptsa
  SOB Cough Phlegm Chest Painb Wheeze Trouble Sleeping Headache Fatiguec Back Pain Dizzinessd Congestione Weak Legsf Nasal Drainage Heart Palpitations Foot/Ankle Swelling Dry Mouth Tight Throat Numb Face, Lips Inability to Think, Reason
Group 1 (n = 9)                    
102-002 S   P S S P              
102-015 S S S S     S            
102-018 S S S S   P      S   S       
102-028 S S S S   S S   S S   S        
102-033 S S S S S P   S            
102-035 S S S S S P              
104-001 S S S   P         S       
104-004 S S S P P S S S S    S   S      
104-006 S S S   P               
Group 2 (n = 9)                    
103-003 S S S S S               
103-011 S S S S P   P     S         
104-008 S S S S S S P S        S     
104-011 S S S P      S    S        
105-001 S S S S S P     S          
105-002 S     S   P S            
105-003 S S S      S         S    
105-005 S S S P P               
105-006 S S S S P   P             
Group 3 (n = 9)                    
103-009 S S S   P P   S   S        S S S
103-012 S S S   P S P             
106-004 S P P S P P              
106-006 S       P             
106-007 S S P   P P P   S           
106-010 S S S   S               
106-015 S S S S                
106-016 S                   
106-017 S S S P S S              
Group 4 (n = 8)                    
102-036 S P P                 
102-040 S S S P                
102-039 S S S S P S P     S         
102-037 S S P S S S              
108-002 S S S   P               
108-003 S P P      S    S         
108-006 S S P S P P S     S         
108-007 S    P P   S             
Spontaneous 35 27 24 16 10 7 4 8 4 3 5 3 2 1 1 1 1 1 1
Probed 0 3 7 6 14 9 8 0 0 0 0 0 0 0 0 0 0 0 0
TOTAL (S + P) 35 30 31 22 24 16 12 8 4 3 5 3 2 1 1 1 1 1 1
  1. a These “additional concepts” were not included in the symptom checklist used by interviewers, thus these concepts were not probed for by the interviewer rather they spontaneously emerged from subjects
  2. b Includes “chest tightness” and “chest discomfort”
  3. c Includes “exhaustion,” “lack of energy,” “tiredness,” “malaise” and “weakness”
  4. d Includes “lightheadedness”
  5. e Includes “nasal stoppage”
  6. f Includes “legs dragging”