. 2009 Dec 29;4:443–452. doi: 10.2147/copd.s8577

Table 2.

Annual ΔFEV₁ for the augmented and the non-augmented groups

Stratification	Groups				P-value
	Augmented		Non-augmented
	n	ΔFEV₁ (mL/year)	n	ΔFEV₁ (mL/year)
Initial FEV₁
<30% pred	30	0.86 (17.63)	3	20.10 (31.06)	0.59
30%–65% pred	79	2.08 (24.03)	10	−51.92 (18.14)	0.07
>65% pred	15	−108.7 (17.29)	27	−29.24 (15.29)	0.0006
Initial FEV₁
<50% pred	88	38.30 (33.65)	8	−86.73 (45.37)	0.026
≥50% pred	36	−49.46 (15.88)	32	−32.78 (13.15)	0.42
Smoking
Non-smokers	19	−25.06 (49.53)	15	−38.43 (12.12)	0.79
Ex-smokers	105	24.24 (25.72)	23	−41.19 (22.47)	0.05
Current smokers	0	–	2	–	–
Total	124	10.61 (21.37)	40	−36.96 (12.13)	0.05

Notes: Results shown in the parentheses are standard errors of the estimated change in FEV₁. A positive ΔFEV₁ represents an increase in FEV₁, and a negative ΔFEV₁ corresponds to a decrease in FEV₁.