Table 2 Clinical and radiological characteristics of the enrolled population

Age, n (%)

 > 65 years old

103 (66)

 ≤ 65 years old

53 (44)

Sex, n (%)

 Male

87 (55.8)

 Female

69 (44.2)

Smoking history,n (%)

 ≥ 20 packs/year

59 (37.8)

 < 20 packs/year

97 (62.2)

Nodule morphology,n (%)

 pGGO

50 (32)

 Part-solid nodules

106 (68)

Tumour diameter, median (IQR)

21 mm (15–28 mm)

Solid component diameter, median (IQR)

12 mm (IQR 9–17.75 mm)

Consolidation-to-tumour ratio in part solid nodules, median (IQR)

0.58 (IQR 0.41–0.72)

Tumour doubling time

 ≥ 400 days

52 (33.3)

 < 400 days

75 (48.1)

 Not evaluable

29 (18.6)

Predominant histological subtype,n (%)

 Lepidic

40 (25.6)

 Acinar or tubular

88 (56.4)

 Solid or micropapillary

12 (7.7)

 Other

16 (10.3)

Pathological TNM stage*, n (%)

 IA

104 (66.7)

 IB

37 (23.7)

 IIA

2 (1.3)

 IIB

6 (3.8)

 III

7 (4.5)