Table 1 Baseline characteristics of the enrolled patients before and after propensity-score matching
Variables | Before match (N = 117) | After match (N = 51) | ||||||
|---|---|---|---|---|---|---|---|---|
STAS positive | STAS negative | Z/x2 value | P-value | STAS positive | STAS negative | P-value | ||
N | 17 | 100 | 17 | 34 | ||||
Sex, n (%) | Male | 9 (52.9) | 50 (50.0) | 0.05 | 0.823 | 9 (52.9) | 21 (61.8) | 0.763 |
Age | Median [Min, Max] | 61.0 [44.0, 75.0] | 61.5 [30.0, 82.0] | −0.147 | 0.883 | 61.0 [44.0, 75.0] | 64.0 [34.0, 82.0] | 0.358 |
<65 | 14 (82.4) | 59 (59.0) | 3.377 | 0.066 | 14 (82.4) | 19 (55.9) | 0.120 | |
Smoking status, n (%) | Ever | 5 (29.4) | 31 (31.0) | 0.017 | 0.896 | 5 (29.4) | 14 (41.2) | 0.609 |
BMI | Median [Min, Max] | 22.9 [21.5, 25.3] | 24.2 [21.4, 26.0] | −0.623 | 0.534 | 22.9 [17.9, 32.0] | 23.7 [17.6, 29.3] | 0.806 |
≥ 24 | 6 (35.5) | 53 (53.0) | 1.822 | 0.177 | 6 (35.3) | 17 (50.0) | 0.486 | |
Hypertension, n (%) | Positive | 2 (11.8) | 26 (26.0) | 1.617 | 0.203 | 2 (11.8) | 8 (23.5) | 0.533 |
Diabetes, n (%) | Positive | 1 (5.9) | 32 (32.0) | 4.895 | 0.027 | 1 (5.9) | 14 (41.2) | 0.023 |
CAD, n (%) | Positive | 7 (41.2) | 42 (42.0) | 0.004 | 0.949 | 7 (41.2) | 17 (50.0) | 0.766 |
Family history, n (%) | Positive | 0 (0) | 2 (2.0) | 0.364 | 0.546 | 0 (0) | 3 (8.8) | 0.528 |
History of pulmonary disease, n (%) | Positive | 14 (82.4) | 61 (61.0) | 4.239 | 0.040 | 14 (82.4) | 21 (61.8) | 0.241 |
Longest diameter, cm | 1.800, 1.480 | 1.600, 0.880 | −0.821 | 0.412 | 1.80 [0.61, 2.80] | 1.90 [0.60, 3.00] | 0.886 | |
Size of solid components, cm | 1.600, 1.790 | 0.950, 1.800 | −2.166 | 0.030 | 1.60 [0, 2.80] | 0.95 [0, 2.90] | 0.175 | |
Lobulation, n (%) | Positive | 17 (100.0) | 86 (86.0) | 2.703 | 0.100 | 17 (100) | 32 (94.1) | 0.799 |
Spiculation, n (%) | Positive | 16 (94.1) | 63 (63.0) | 6.416 | 0.011 | 16 (94.1) | 43 (63.2) | 0.030 |
Vacuole, n (%) | Positive | 11 (64.7) | 54 (54.0) | 0.674 | 0.411 | 11 (64.7) | 34 (50.0) | 0.415 |
Pleural indentation, n (%) | Positive | 16 (94.1) | 60 (60.0) | 7.43 | 0.006 | 16 (94.1) | 37 (54.4) | 0.006 |
Internal vascular sign, n (%) | Positive | 17 (100.0) | 99 (99.0) | 0.171 | 0.679 | 17 (100) | 67 (98.5) | 0.996 |
Bronchial anomaly sign | Positive | 17 (100.0) | 96 (96.0) | 0.704 | 0.401 | 17 (100) | 66 (97.1) | 0.997 |
Location, n (%) | Right Lung | 14 (82.4) | 61 (61.0) | 2.879 | 0.090 | 14 (82.4) | 44 (64.7) | 0.268 |
Lobar lung, n (%) | Superior lobe | 8 (47.1) | 68 (68.0) | 2.799 | 0.094 | 8 (47.1) | 44 (64.7) | 0.290 |
Pulmonary nodule type, n (%) | Solid nodule | 13 (76.5) | 44 (44.0) | 6.132 | 0.013 | 13 (76.5) | 29 (42.6) | 0.026 |
CTR | 1.000, 0.110 | 0.690, 1.000 | −2.166 | 0.030 | 1.000, 0.110 | 0.630, 1.000 | < 0.001 | |