Figure 3From: A probabilistic model of biological ageing of the lungs for analysing the effects of smoking, asthma and COPDFVC of healthy individuals and smokers. (a): FVC measurements (in litres) of healthy individuals (Group H, blue) and smokers (Group S, red). (b): Mean change of FVC for healthy individuals and smokers over ages. To enforce smoothness, each mean value is calculated over an age interval of 11 years (the X-axis labels indicate the ages at the middle of the intervals).Back to article page