Table 2: Demographic Data and Outcome Measures of Patients in the Different Study Groups

	Age (Range)	Male/Female	Smoker	HHS	UCLA
Pre-OP	55 ± 9 (39-76 y)	23M/23F	7%	47 ± 14	4.8 ± 2.3
≤ 6 months	60 ± 10 (42-71 y)	8M/32F	14%	75 ± 16	4.7 ± 1.9
1-2 years	56 ± 11 (31-72 y)	4M/19F	11%	85 ± 14	6.0 ± 1.3
years	51 ± 8 (32-64 y)	12M/14F	8%	87 ± 13	6.6 ± 1.6
> 4 years	52 ± 8 (33-65 y)	21M/15F	8%	90 ± 11	7.1 ± 1.6