Table 2 CT radiological features of training, validation and testing datasets in two groups.

From: Predicting the severity of mycoplasma pneumoniae pneumonia in pediatric and adult patients: a multicenter study

Characteristic

Training cohort N = 440

Validation cohort N = 110

Testing cohor N = 278

Overall N = 828

NSMPP

N = 299(68%)

SMPP

N = 141(32%)

p-value1

NSMPP

N = 75(68%)

SMPP

N = 35(32%)

p-value1

NSMPP

N = 224(81%)

NSMPP

N = 54(19%)

p-value1

p-value1

Lobar atelectasis

25 (8.4%)

26(18.4%)

0.002

3 (4.0%)

6 (17.1%)

0.028

17 (7.6%)

9 (16.7%)

0.040

0.83

Consolidation pattern

  

< 0.001

  

0.005

  

< 0.001

< 0.001

 Patchy

69 (23.1%)

23 (16.3%)

 

16 (21.3%)

8 (22.9%)

 

70 (31.3%)

11 (20.4%)

  

 Segmental

58 (19.4%)

39 (27.7%)

 

21 (28.0%)

10 (28.6%)

 

67 (29.9%)

14 (25.9%)

  

 Wedge-shaped

43 (14.4%)

44 (31.2%)

 

6 (8.0%)

11 (31.4%)

 

40 (17.9%)

26 (48.1%)

  

Consolidation mixed GGO

85 (28.4%)

52 (36.9%)

0.074

18 (24.0%)

12 (34.3%)

0.26

111(49.6%)

39 (72.2%)

0.003

< 0.001

Adjacent pleura thickening

69 (23.1%)

51 (36.2%)

0.004

20 (26.7%)

15 (42.9%)

0.089

7 (3.1%)

5 (9.3%)

0.061

< 0.001

Pleural effusion

  

< 0.001

  

< 0.001

  

< 0.001

< 0.001

 Small

21 (7.0%)

30 (21.3%)

 

4 (5.3%)

12 (34.3%)

 

6 (2.7%)

9 (16.7%)

  

 Moderate

7 (2.3%)

15 (10.6%)

 

1 (1.3%)

0 (0.0%)

 

1 (0.4%)

1 (1.9%)

  

 Large

5 (1.7%)

8 (5.7%)

 

1 (1.3%)

1 (2.9%)

 

2 (0.9%)

1 (1.9%)

  

Mediastinal enlargement of lymph nodes

33 (11.0%)

32 (22.7%)

0.001

9 (12.0%)

8 (22.9%)

0.14

18 (8.0%)

3 (5.6%)

0.77

0.010

Air bronchogram sign

92 (30.8%)

70 (49.6%)

< 0.001

24 (32.0%)

18 (51.4%)

0.051

127 (56.7%)

46 (85.2%)

< 0.001

< 0.001

Interlobular septal thickening

72 (24.1%)

51 (36.2%)

0.008

14 (18.7%)

11 (31.4%)

0.14

30 (13.4%)

12 (22.2%)

0.10

< 0.001

Reticular pattern

32 (10.7%)

26 (18.4%)

0.025

5 (6.7%)

5 (14.3%)

0.28

20 (8.9%)

7 (13.0%)

0.37

0.26

Fiber cords

183 (61.2%)

105 (74.5%)

0.006

57 (76.0%)

23 (65.7%)

0.26

54 (24.1%)

13 (24.1%)

> 0.99

< 0.001

Number of lobes involved

  

< 0.001

  

0.65

  

0.53

< 0.001

 1

143(47.8%)

51 (36.2%)

 

28(37.3%)

12(34.3%)

 

79 (35.3%)

18 (33.3%)

  

 2

42 (14.0%)

10 (7.1%)

 

11 (14.7%)

2 (5.7%)

 

49 (21.9%)

9 (16.7%)

  

 3

36 (12.0%)

12 (8.5%)

 

11 (14.7%)

6 (17.1%)

 

36 (16.1%)

8 (14.8%)

  

 4

29 (9.7%)

16 (11.3%)

 

8 (10.7%)

3 (8.6%)

 

20 (8.9%)

9 (16.7%)

  

 5

49 (16.4%)

52 (36.9%)

 

17 (22.7%)

12 (34.3%)

 

40 (17.9%)

10 (18.5%)

  

Average lesion density(Hu)

-511 (138)

-439 (173)

< 0.001

-533 (135)

-388 (161)

< 0.001

-463 (169)

-334 (192)

< 0.001

0.003

CTLP(%)

5.84(10)

5.76 (9)

0.72

5.49 (11)

7.87(13)

0.29

0.06 (0.08)

4.03 (9.53)

< 0.001

< 0.001

  1. CTLP CT lesion percentage.
  2. 1Pearson’s Chi-squared test; Wilcoxon rank sum test; Fisher’s exact test.
  3. 2Pearson’s Chi-squared test; Kruskal-Wallis rank sum test; Fisher’s exact test.
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