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Table 1 Demographic and clinical data of the study population (n = 25)

From: MRC chronic Dyspnea Scale: Relationships with cardiopulmonary exercise testing and 6-minute walk test in idiopathic pulmonary fibrosis patients: a prospective study

Variables (n)  
Age, year (n = 25) (mean ± SD) 67.5 (± 8.3)
Sex (M/F) (n = 25) 17/8
Smoking history
Ex smoker (n) % 13 (52%)
No smoker (n) % 11 (44%)
Smoker (n) % 1 (4%)
PY (mean ± SD) 25.4 (± 34.2)
MRC chronic dyspnea score
0.0 (n) % 2 (8%)
1.0 (n) % 8 (32%)
2.0 (n) % 8 (32%)
3.0 (n) % 6 (24%)
4.0 (n) % 1 (4%)
5.0 (n) % 0 (0%)
  1. M/F Male/Female, PY Pack/years