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Table 2 Frequency of nodules type and size as described by radiologist A, radiologist B and CAD system (N = 79)

From: Assessment of artificial intelligence-aided computed tomography in lung cancer screening

Variables

Radiologist A

Radiologist B

CAD system

p value

No. of total nodules

    

Median (range)

1 (0–10)

1 (0–13)

1 (0–100)

0.2171

Total nodules

    

Absent

39 (49.4%)

35 (44.3%)

22 (27.8%)

< 0.001*b

Present

40 (50.6%)

44 (55.7%)

57 (72.2%)

 

Size of total nodules

    

 ≤ 6 mm

19 (24.1%)

23 (29.1%)

29 (36.7%)

 

 > 6 mm

21 (26.5%)

21 (26.6%)

28 (35.5%)

0.108b

Solid nodules

    

No. of solid nodules

    

Median (range)

1 (0–10)

0 (0–13)

1 (0–91)

0.323a

Solid nodules

    

Absent

39 (49.4%)

42 (44.3%)

32 (40.5%)

0.105b

Present

40 (50.6%)

37 (55.7%)

47 (59.5%)

 

Size of solid nodules

    

≤ 6 mm

18 (22.8%)

20 (30.3%)

23 (30.4%)

0.332a

> 6 mm

22 (27.8%)

17 (25.4%)

24 (29.1%)

 

Subsolid nodules

    

No. of subsolid nodules

    

Median (range)

0 (0–1)

0 (0–2)

0 (0–9)

0.005*a

Subsolid nodules (n, %)

    

Absent

69 (87.4%)

62 (78.5%)

54 (68.4%)

0.002*b

Present

10 (12.6%)

17 (21.5%)

25 (31.6%)

 

Size of subsolid nodules

    

≤ 6 mm

10 (12.6%)

11 (13.9%)

14 (17.7%)

 

> 6 mm

0 (0%)

6 (7.6%)

11 (13.9%)

0.039*b

Calcified nodules

    

No. of calcified nodules

    

Median (range)

0 (0–1)

0 (0–1)

0 (0–1)

1.00a

Calcified nodules (n, %)

    

Absent

78 (98.7%)

78 (98.7%)

78 (98.7%)

1.00c

Present

1 (1.3%)

1 (1.3%)

1 (1.3%)

 

Size of calcified nodules

    

≤ 6 mm

1 (1.3%)

1 (1.3%)

1 (1.3%)

1.00c

> 6 mm

0 (0%)

0 (0%)

0 (0%)

 
  1. *Statistically significant as p < 0.05
  2. aKruskal–Wallis test
  3. bChi-square test
  4. cFisher exact test