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

Respiratory Research

Table 3 Respiratory symptoms according to spirometry results. PneumoLaus study, 2014–2017, Lausanne, Switzerland

	Overall	Normal spirometry	Chronic obstruction	Reversible obstruction	Possible restriction	p-value
N	3342	3070	128	83	61
Chronic cough	146 (4.4)	119 (3.9)	19 (14.8)	5 (6.0)	3 (4.9)	< 0.001
Chronic sputum production	82 (2.5)	58 (1.9)	17 (13.3)	4 (4.8)	3 (4.9)	< 0.001
Dyspnoea according to mMRC scale						< 0.001
0	1730 (51.8)	1635 (53.3)	45 (35.2)	33 (39.8)	17 (27.9)
1	1563 (46.8)	1400 (45.6)	76 (59.4)	48 (57.8)	39 (63.9)
≥ 2	49 (1.5)	35 (1.1)	7 (5.5)	2 (2.4)	5 (8.2)

COPD chronic obstructive pulmonary disease, mMRC Modified Medical Research Council dyspnoea scale. Results are expressed as number of participants and (column percentage). Between-group analysis performed using Fisher’s exact test. The group “chronic obstruction” also contains the subjects with both “chronic obstruction and possible restriction”. The group “reversible obstruction” also contains the subject with both “reversible obstruction and possible restriction”

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