Table 3.

Percentage of SARS survivors with lung function parameters < 80% of predicted of the old and the updated local reference values, and the percentage of survivors with PImax and PEmax less than 80 cm H₂O at 24 months

	Percentage of patients with impairment using the old reference value † , % (n)	Percentage of patients with impairment using the new reference value ‡ , % (n)
FEV1	12.7 (7)	18.2 (10)
FVC	14.5 (8)	16.4 (9)
VC	14.5 (8)
TLC	10.9 (6)
DLCO	43.6 (24)	52.7 (29)
KCO	5.5 (3)	21.8 (12)
PI max < 80, cm H2O	34.5 (19)
PE max < 80, cm H2O	10.9 (6)

^† Old reference values: Da Costa, ²⁰ Burrows et al. ²¹

^‡ New reference value Ip et al. ²² , ²³

KCO, gas transfer corrected for alveolar volume; Pemax, maximum static expiratory pressure; Pimax, maximum static inspiratory pressure; SARS, severe acute respiratory syndrome.