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Table 4 Respiratory symptoms according to definition of obstruction. PneumoLaus study, 2014–2017, Lausanne, Switzerland

From: GLI 2012 equations define few spirometric anomalies in the general population: the PneumoLaus study

  Group 1: FEV1/FVC < LLN Group 2: FEV1/FVC > LLN but < 0.7 Group 3: FEV1/FVC > LLN and > 0.7 p-value Group 1 vs. 2 p-value Group 2 vs. 3 p-value Group 1 vs. 3
N 188 (5.6) 224 (6.7) 2930 (87.7)    
Chronic cough 21 (11.2) 11 (4.9) 113 (3.9) 0.018 0.428 < 0.001
Chronic sputum production 18 (9.6) 7 (3.1) 56 (1.9) 0.006 0.208 < 0.001
Chronic dyspnoea mMRC ≥2 8 (4.3) 5 (2.2) 36 (1.2) 0.241 0.199 0.001
  1. Results are expressed as number of participants and (percentage) for categorical variables. Between-group analysis performed using chi-square test. mMRC Modified Medical Research Council dyspnoea scale