Table 3. Patient demographics after PSM (n=200).
| Characteristics | RATS (n=100) | VATS (n=100) | P value |
|---|---|---|---|
| Age (years), mean (SD) | 68.9 (8.8) | 68.8 (9.2) | 0.94 |
| Sex (male/female), n | 52/48 | 51/49 | 0.99 |
| BMI (kg/m2), mean (SD) | 23.4 (3.5) | 23.0 (3.6) | 0.47 |
| Smoking status, n | 0.88 | ||
| Ever | 70 | 68 | |
| Never | 30 | 32 | |
| %VC, mean (SD) | 112.3 (15.8) | 114.6 (16.5) | 0.32 |
| FEV1%, mean (SD) | 76.4 (11.1) | 76.2 (15.2) | 0.92 |
| Tumor laterality, n | 0.46 | ||
| Right | 61 | 67 | |
| Left | 39 | 33 | |
| Primary lobe, n | 0.75 | ||
| Right upper lobe | 33 | 40 | |
| Right middle lobe | 8 | 5 | |
| Right lower lobe | 20 | 22 | |
| Left upper lobe | 23 | 20 | |
| Left lower lobe | 16 | 13 | |
| Incomplete fissure, n | 0.99 | ||
| − | 94 | 93 | |
| + | 6 | 7 | |
| Clinical stage, n | 0.45 | ||
| IA1 | 15 | 14 | |
| IA2 | 31 | 30 | |
| IA3 | 28 | 19 | |
| IB | 9 | 11 | |
| IIA | 3 | 8 | |
| IIB or more | 14 | 18 | |
| Maximum tumor size (mm), mean (SD) | 20.5 (11.7) | 21.0 (10.9) | 0.76 |
| Pathological stage, n | 0.21 | ||
| IA1 | 10 | 18 | |
| IA2 | 32 | 23 | |
| IA3 | 17 | 17 | |
| IB | 18 | 20 | |
| IIA | 0 | 5 | |
| IIB or more | 23 | 24 |
Incomplete fissure: “−” means absence, and the “+” means presence of the incomplete fissure ≥ grade 3. PSM, propensity score matching; RATS, robot-assisted thoracoscopic surgery; VATS, video-assisted thoracoscopic surgery; SD, standard deviation; BMI, body mass index; %VC, percent vital capacity; %FEV1, percent forced expired volume in 1 second.