Table 1.

Calculation of the 2008 score

2008 score	Points
Age
● < 70 years	0
● > = 70 years	1
MRC (baseline, steady state)
●0-1	0
●2-3	1
●4-5	2
Number of signs of severity* at entry
●0	0
●1-2	2
●3 and more	3

*signs of severity: cyanosis, use of accessory inspiratory muscles, paradoxical abdominal movement, asterixis, neurological impairment, lower limb edema.

Total score ranges from 0 to 6. Tertiles of the original (2008) population corresponded to scores of 0–1, 2–3 and 4–6, respectively.