Table 3.

Multiple regression of change in FVC (% predicted).

	Value	Std.Error	t-value	p-value
Intercept	117.4	11.2	10.440	0.000
Time since baseline PFTs (in years)	−0.902	0.500	−1.80	0.072
MIRS=II (ref: MIRS I)	−8.84	5.57	−1.58	0.113
MIRS=III (ref: MIRS I)	−8.78	5.67	−1.55	0.122
MIRS=IV (ref: MIRS I)	−13.9	5.51	−2.53	0.012
MIRS=V (ref: MIRS I)	−13.7	6.10	−2.25	0.025
MIRS= III (ref: MIRS IV & V)	5.090	1.983	2.566	0.011
CTG	−0.014	0.003	−4.78	0.000
Age at time obtained	−0.755	0.285	−2.65	0.008