Table 2.

Patients’ demographic and clinical characteristics

Characteristic	n (%) or mean ± SD (n = 1265)
Age (years)	68.3 ± 5.1
Sex
Male	888 (70.2)
Female	377 (29.8)
Previous lung surgery
No	1238 (97.9)
Yes	27 (2.1)
Chronic obstructive pulmonary disease
No	1198 (94.7)
Yes	67 (5.3)
Tuberculosis
No	1258 (99.4)
Yes	7 (0.6)

SD, standard deviation