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Table 1 The clinical characteristics of the participants

From: Efficacy of concurrent treatments in idiopathic pulmonary fibrosis patients with a rapid progression of respiratory failure: an analysis of a national administrative database in Japan

  N (%) Mean ± SD
Patients 209  
Age, years 209 72.3 ± 9.6
 <60 17 (8.1)  
 60–69 52 (24.9)  
 70–79 98 (46.9)  
 ≥80 42 (20.1)  
Male 172 (82.3)  
BMI, kg/m2 178 22.3 ± 3.8
 <18.5 27 (15.2)  
 18.5–25 114 (64.0)  
 >25 37 (20.8)  
Brinkman Index 184 599.5 ± 675.7
 0 68 (37.0)  
 1–800 45 (24.5)  
 >800 71 (33.6)  
F, H-J Classification scale 166  
 1 2 (1.2)  
 2 4 (2.4)  
 3 7 (4.2)  
 4 28 (16.9)  
 5 125 (75.3)  
Season   
 Spring 48 (23.0)  
 Summer 34 (16.2)  
 Fall 56 (26.8)  
 Winter 71 (34.0)*  
Specialty hospital   
 Yes/No 173 (82.8)/36 (17.2)  
Arrival by ambulance   
 Yes/No 101 (48.3)/108 (51.7)  
  1. Abbreviations: BMI body mass index, F, H-J Fletcher, Hugh-Jones. Values are given as mean ± SD or n (%). The total dose was not equal to 209 because there were missing values in the data file. *Significantly different in comparison to spring (p = 0.018, poisson regression)