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Figure 4 | Respiratory Research

Figure 4

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

Figure 4

Probabilistic model of biological age. Generative process induced by our model. The two plate sections indicate that the enclosed structures are repeated for all 8 groups and N measurements. Combined smoking, asthma and COPD status cn (through parameters u c n , v c n and the addition of a noise term εn representing influence of smoking habits, lung disease, and unmeasured factors such as environmental and genetic factors that are specific to the nth measurement) transforms chronological age an into biological age ã n . Biological age ã n and height hn generate (through parameters b and the addition of a noise term ηn representing measurement noise) lung function measurement ln.

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