Table 1. Demographic and clinical characteristics of the study population.
| Variables | Unmatched groups | Matched groups | |||||
|---|---|---|---|---|---|---|---|
| PCNB group (n = 113) | SB group (n = 245) | P value | PCNB group (n = 58) | SB group (n = 58) | P value | ||
| Age, yr | 65.6 ± 10.0 | 62.9 ± 10.1 | 0.019 | 64.7 ± 10.3 | 65.0 ± 8.7 | 0.833 | |
| Sex, male | 46 (40.7) | 96 (39.2) | 0.784 | 19 (32.8) | 18 (31.0) | 0.827 | |
| Smoking | 0.974 | 0.722 | |||||
| Never | 77 (68.1) | 168 (68.6) | 43 (74.1) | 45 (77.6) | |||
| Ex | 28 (24.8) | 60 (24.5) | 13 (22.4) | 10 (17.2) | |||
| Current | 8 (7.1) | 15 (6.1) | 2 (3.5) | 3 (5.2) | |||
| FEV1, % | 106.8 ± 17.6 | 108.2 ± 16.9 | 0.485 | 107.0 ± 19.1 | 108.3 ± 14.9 | 0.685 | |
| DLCO, % | 92.0 ± 16.2 | 94.8 ± 17.7 | 0.153 | 91.4 ± 15.3 | 93.7 ± 15.3 | 0.546 | |
| Size of tumor, mm | 20.0 ± 6.0 | 17.2 ± 6.3 | < 0.001 | 17.9 ± 5.9 | 17.4 ± 6.4 | 0.580 | |
| C/T ratio | 0.95 ± 0.13 | 0.60 ± 0.33 | < 0.001 | 0.90 ± 0.17 | 0.89 ± 0.18 | 0.621 | |
| Clinical T stage | < 0.001 | 0.706 | |||||
| cT1 | 93 (82.3) | 230 (93.9) | 52 (89.7) | 53 (91.4) | |||
| cT2 | 18 (15.9) | 15 (6.1) | 6 (10.3) | 5 (8.6) | |||
| cT3 | 2 (1.8) | 0 | 0 | 0 | |||
| Clinical N stage | NA | NA | |||||
| cN0 | 113 (100.0) | 245 (100.0) | 58 (100.0) | 58 (100.0) | |||
Data are presented as mean ± standard deviation or number (%).
PCNB = percutaneous needle biopsy, SB = surgical biopsy, FEV1 = forced expiratory volume in one second, DLCO = diffusing capacity of carbon monoxide, C/T ratio = consolidation/tumor ratio.