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Table 2 Score of each anchor item, the distribution of the items and the polychoric correlation of each item with NYHA classification

From: Indirect calibration between clinical observers - application to the New York Heart Association functional classification system

  Raw
Score
N (%) r+
   Total   N = 265  
Do you usually have breathlessness or difficulty breathing? ("dyspnea")   N = 263 (99.2)  
   Yes, when walking on steep plane 0 185 (70.3) 0.57
   Yes, when walking on the horizontal plane 1 68 (25.9)  
   Yes, even at rest 2 10 (3.8)  
If yes, how long can you walk before you have to stop?
("distance")*
  N = 232 (87.5)  
   0-100 metres 2 97 (41.8) 0.33
   101-500 metres 1 86 (37.1)  
   501-2500 metres 0 49 (21.1)  
If yes, after how many sets of stairs (10-15 steps) do you have to stop? ("stairs")*   N = 258 (97.3)  
   1 set 2 93 (36.0) 0.66
   2 sets 1 75 (29.1)  
   3 or more sets 0 90 (34.9)  
If yes, in your view, what level of effort induces breathlessness? ("effort")   N = 257 (97.0)  
   Great efforts 0 105 (40.9) 0.67
   Average efforts 1 89 (34.6)  
   Small efforts 2 63 (24.5)  
   Median (IQR)  
Raw score (0-8)   4 (2-6) 0.62
  1. * inverse order for the final score
  2. + polychoric correlation between each item and NYHA classification of all observers
  3. IQR: interquartile range.