Table 5.

Mean hospital stay (days of hospitalisation) in relation to each radiographic quantification system and the presence/absence of radiological characteristics.

Variable present/absent	Median days in hospital	P value
Linear opacities present/absent	9/8	P = .012
Alveolar pattern present/absent	10/8	P = .134
Classification 6A mod-severe/mild	9/6	P = .0032
Classification 6B mod-severe/mild	9/7	P = .0281
Classification 8 mod-severe/mild	9/7	P = .0088

Combination of variables	Median days in hospital	P value
6A mod-severe + linear opacities/mild + linear op. absent	10/8	P = .0041
6A mod-severe + alveolar pattern/mild + alveolar p. absent	10/8	P = .0947
6B mod-severe + linear opacities/mild + linear op. absent	10/8	P = .0019
6B mod-severe + alveolar pattern/mild + alveolar p. absent	10/8	P = .1237
8 mod-severe + linear opacities/mild + absent finding	10/8	P = .0015
8 mod-severe + alveolar pattern/mild + alveolar p. absent	10/8	P = .0805

P value in the Wilcoxon text.