TABLE 1.
Clinicopathological characteristics of the MDS and TDS groups (before and after propensity score matching)
| Characteristics | Before propensity score matching | After propensity score matching | ||||||
|---|---|---|---|---|---|---|---|---|
| MDS group (n = 121) | TDS group (n = 279) | T/χ 2 | p | MDS group (n = 120) | TDS group (n = 120) | T/χ 2 | p | |
| Age (years) | 50.86 ± 11.46 | 53.76 ± 10.95 | −2.400 | 0.017 | 51.15 ± 11.05 | 51.03 ± 11.60 | 0.08 | 0.936 |
| Sex (%) | 4.804 | 0.028 | 0.019 | 0.891 | ||||
| Male | 40 (33.1) | 125 (44.8) | 40 (33.3) | 41 (34.2) | ||||
| Female | 81 (66.9) | 154 (55.2) | 80 (66.7) | 79 (65.8) | ||||
| BMI a | 23.04 ± 3.16 | 23.12 ± 3.31 | −0.175 | 0.861 | 45.60 ± 247.53 | 23.02 ± 3.41 | 0.999 | 0.319 |
| Smoking (%) | 15 (12.4) | 63 (22.6) | 5.576 | 0.018 | 15 (12.5) | 16 (13.3) | 0.037 | 0.847 |
| Emphysema (%) | 1 (0.8) | 12 (4.3) | 3.241 | 0.072 | 1 (0.8) | 2 (1.7) | 0.338 | 0.561 |
| Pulmonary function | ||||||||
| FEV1 (L) | 2.65 ± 0.64 | 2.64 ± 0.67 | 0.177 | 0.859 | 2.64 ± 0.64 | 2.68 ± 0.70 | −0.453 | 0.651 |
| Actual FEV1/pre‐FEV1 (%) | 100.23 ± 16.54 | 99.33 ± 20.09 | 0.432 | 0.666 | 100.10 ± 16.55 | 101.34 ± 24.51 | −0.461 | 0.645 |
| MVV (L) | 90.83 ± 19.25 | 90.44 ± 20.32 | 0.177 | 0.859 | 90.71 ± 19.29 | 91.89 ± 20.99 | −0.453 | 0.651 |
| Actual MVV/pre‐MVV (%) | 89.17 ± 15.67 | 86.95 ± 12.30 | 1.523 | 0.128 | 88.44 ± 13.49 | 88.51 ± 11.64 | −0.04 | 0.968 |
| Lesion location (%) b | 10.028 | 0.348 | 0.338 | 0.845 | ||||
| Single lobe | 112 (92.6) | 256 (91.8) | 111 (92.5) | 110 (91.7) | ||||
| Two lobes | 1 (0.8) | 3 (1.1) | 1 (0.8) | 2 (1.7) | ||||
| Three lobes | 8 (6.6) | 20 (7.1) | 8 (6.7) | 8 (6.6) | ||||
| Maximum lesion diameter (cm) | 1.06 ± 0.63 | 1.10 ± 0.60 | −0.436 | 0.663 | 1.02 ± 0.56 | 1.02 ± 0.54 | −0.024 | 0.981 |
| Pathological types (%) | 6.8 | 0.147 | 7.012 | 0.135 | ||||
| Primary cancer | 57 (47.1) | 102 (36.6) | 55 (45.8) | 50 (41.7) | ||||
| Metastatic tumor | 3 (2.5) | 12 (4.3) | 45 (37.5) | 58 (48.3) | ||||
| Benign disease | 51 (42.2) | 138 (49.5) | 13 (10.8) | 7 (5.8) | ||||
| Mixture c | 6 (4.9) | 23 (8.2) | 2 (1.7) | 4 (3.3) | ||||
| Others | 4 (3.3) | 4 (1.4) | 5 (4.2) | 1 (0.9) | ||||
a
BMI refers to body mass index, which is the weight (kg) divided by height (m)^2.
b
Lesion location refers to a single lobe, or two or three lobes where the lesions are removed.
c
Mixture refers to patients who have multiple nodules at the same time. The pathological result is a mixture of lesions, for example primary lung cancer and benign lesions.