Fig. 1: Schematic representation of the three-state Markov model.
From: Air pollution and dynamic transitions of preserved ratio impaired spirometry in UK Biobank
Red arrows represent the disease progression from normal spirometry to PRISm, from PRISm to COPD and from normal spirometry to COPD. Green arrows represent the disease reversion from PRISm back to normal spirometry, from COPD to PRISm and from COPD to normal spirometry.
