Table 2 Baseline characteristics of T1b NSCLC patients who were diagnosed in 2003–2013
Variables | Period between 2003 and 2008 | Period between 2009 and 2013 | ||||
|---|---|---|---|---|---|---|
Lobectomy (n = 703) | Lobectomy with MLND (n = 1333) | p | Lobectomy (n = 484) | Lobectomy with MLND (n = 1838) | p | |
Mean ± SD Age (years) | 66.94 ± 9.66 | 66.10 ± 9.71 | 0.06 | 66.98 ± 9.29 | 66.48 ± 9.23 | 0.28 |
Sex, no. (%) | 0.39 | 0.24 | ||||
male | 312 (44.4) | 565 (42.4) | 222 (45.9) | 788 (42.9) | ||
female | 391 (55.6) | 768 (57.6) | 262 (54.1) | 1050 (57.1) | ||
Race, no. (%) | 0.99 | 0.70 | ||||
White | 613 (87.2) | 1162 (87.2) | 408 (84.3) | 1536 (83.6) | ||
Black/ Others | 90 (12.8) | 171 (12.8) | 76 (15.7) | 302 (16.4) | ||
Histology, no. (%) | 0.18 | 0.46 | ||||
Squamous cell carcinoma | 215 (30.6) | 370 (27.8) | 135 (27.9) | 482 (26.2) | ||
Adenocarcinoma | 488 (69.4) | 963 (72.2) | 349 (72.1) | 1356 (73.8) | ||
Grade, no. (%) | 0.62 | 0.47 | ||||
I | 103 (14.7) | 177 (13.3) | 85 (17.6) | 370 (20.1) | ||
II | 363 (51.6) | 702 (52.7) | 251 (51.9) | 971 (52.8) | ||
III | 210 (29.9) | 417 (31.3) | 130 (26.9) | 444 (24.2) | ||
IV Unknown | 3 (0.4) | 4 (0.3) | 2 (0.4) | 4 (0.2) | ||
24 (3.4) | 33 (2.5) | 16 (3.3) | 49 (2.7) | |||
Primary site of tumor, no. (%) | 0.01 | 0.31 | ||||
Upper lobe | 463 (65.9) | 890 (66.8) | 308 (63.6) | 1198 (65.2) | ||
Middle lobe | 62 (8.8) | 66 (5.0) | 33 (6.8) | 93 (5.1) | ||
Lower lobe | 178 (25.3) | 377 (28.3) | 143 (29.5) | 547 (29.8) | ||
Laterality, no. (%) | 0.50 | 0.38 | ||||
Left | 283 (40.3) | 516 (38.7) | 195 (40.3) | 700 (38.1) | ||
Right | 420 (59.7) | 817 (61.3) | 289 (59.7) | 1138 (61.9) | ||