TABLE 1.

Summary of demographic variables of data used in this study.

Age	Mean ± std	67.14 ± 7.01 (%)
	50–59	14.9
	60–69	47.9
	70–79	34.4
	80–89	2.8
Sex
	Male	78.55
	Female	21.45
Smoking status
	Currently smokes	5.4
	Ex-smoker	66.3
	Never smoked	28.3
Relative FVC
	$<$ 50	3.4
	50–69	37.0
	70–89	36.8
	90–109	15.2
	110+	7.6