Table 1.

Possible scenarios studied in the fuzzy logic system between computed tomography (CT) scores and functional indexes in idiopathic pulmonary fibrosis (IPF) patients.

Possible scenario		Model	Data sheet*
1	CT scoresPulmonary function	GGORAHVolumes	min [μGGO; μGGO;RAH]min [μRAH; μGGO;RAH]mahalanobis distance
2	CT scoresPulmonary function	GGORAHVolumes	mahalanobis distancemahalanobis distancemahalanobis distance
3	CT scoresPulmonary function	GGORAHVolumes	mahalanobis distancemahalanobis distancemin [μGGO; μTLC;FVC]min [μRAH; μTLC;FVC]
4	CT scoresPulmonary function	GGORAHVolumes	mahalanobis distancemahalanobis distance[μRAH; μTLC;FVC]. [μTLC;FVC]max [μTLC; μFVC]max [μGGO; μRAH]

*Pertinence values intervals according to functional and radiological features and measure of variability (Mahalanobis distance).

μ: pertinence value replicated to all studied pulmonary function variables, GGO: score of the ground-glass opacity extent, RAH: score of the reticular abnormality and honeycombing extent, TLC: total lung capacity, FVC: forced vital capacity.