A probabilistic model of biological ageing of the lungs for analysing the effects of smoking, asthma and COPD

Respiratory Research

Table 2 Data filtering

Total # of FEV ₁ -FVC measurements	11943
Less males	11280
Less individuals of unknown height	10885
	Groups
		H	A	C	AC	S	SA	SC	SAC
Less individuals of unknown, inconsistent, etc., status	4735	3742	177	19	25	672	18	54	28
Less multiple visits	4489	3742	126	17	19	491	17	50	27
Less half twins (for twins in the same group)	4403	3742	111	17	18	428	17	45	25

Description of the filtering steps applied to the available FEV₁-FVC measurements giving rise to the 4403 measurements used in the study.

ISSN: 1465-993X