Table 3. Distribution of traditional GPS in patients with benign and malignant fGGOs before and after PSM.

	Before PSM (n = 128)				After PSM (n = 82)
	tGPS 0, n (%)	tGPS 1, n (%)	tGPS 2, n (%)	Total, n	tGPS 0, n (%)	tGPS 1, n (%)	tGPS 2, n (%)	Total, n
Benign, n (%)	22 (43.1%)	21 (41.2%)	8 (15.7%)	51	17 (41.5%)	17 (41.5%)	7 (17.0%)	41
Malignant, n (%)	27 (35.1%)	33 (42.8%)	17 (22.1%)	77	15 (36.6%)	17 (41.5%)	9 (21.9%)	41

fGGOs: focal Ground-glass Opacity.

PSM: propensity score matching.

tGPS: traditional Glasgow prognostic score system.