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. 2023 Jun 9;12(6):1221–1235. doi: 10.21037/tlcr-22-815

Table 1. Characteristics of study subjects.

Parameters Adenocarcinoma (n=102) Squamous cell carcinoma (n=111)
Age (years), mean (SD) 65 (8.70) 67.86 (7.10)
Gender, n (%)
   Male 67 (65.69) 97 (87.39)
   Female 35 (34.31) 14 (12.61)
Smoking status, n (%)
   Non-smoker 17 (16.67) 1 (0.90)
   Ex-smoker 20 (19.61) 56 (50.45)
   Current smoker 61 (59.80) 51 (45.95)
Pack-years of ex- and current smokers, median (IQR) 30.00 (16.50–40.00) 40.00 (26.00–50.00)
Stage, n (%)§
   IA 30 (29.4) 29 (26.1)
   IB 25 (24.5) 17 (15.3)
   IIA 18 (17.6) 30 (27.0)
   IIB 12 (11.8) 7 (6.3)
   IIIA 14 (13.7) 8 (7.2)
   IV 3 (2.9) 2 (1.8)

, Information missing from 4 adenocarcinoma and 3 squamous cell carcinoma patients. , Information missing from 39 adenocarcinoma and 26 squamous cell carcinoma patients. §, Information missing from 18 squamous cell carcinoma patients. IQR, interquartile range; n, number; SD, standard deviation.

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