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Table 2 Initial variables of the whole cohort (fever > 120 h)

From: Prediction model for prolonged fever in patients with Mycoplasma pneumoniae pneumonia: a retrospective study of 716 pediatric patients

 

Training cohort (n = 501)

Test cohort (n = 215)

Fever ≥ 120 h

Fever < 120 h

p-value

Fever ≥ 120 h

Fever < 120 h

p-value

Number of patients (n, %)

65 (13.0)

436 (87.0)

 

31 (14.4)

184 (85.6)

 

Age, mean (years)

6.1 ± 2.5

5.7 ± 3.1

0.217

5.7 ± 3.0

5.3 ± 3.1

0.496

Sex ratio (female: male)

1.8

0.9

0.011

2.4

1.0

0.030

Duration of fever (days)

 At admission

4.2 ± 1.4

5.1 ± 2.1

< 0.001

4.4 ± 1.5

4.9 ± 2.0

0.130

 After admission

7.6 ± 3.6

1.7 ± 1.2

< 0.001

7.8 ± 4.1

1.6 ± 1.2

< 0.001

 Total

11.0 ± 3.8

7.0 ± 2.3

< 0.001

11.3 ± 4.6

6.6 ± 2.3

< 0.001

 Total hospital days (days)

11.8 ± 3.7

6.0 ± 2.0

< 0.001

12.0 ± 4.2

5.7 ± 1.7

< 0.001

Initial inflammatory markers

 WBC × 103/µL

7.5 ± 3.4

9.4 ± 6.8

0.030

7.0 ± 3.0

8.6 ± 3.7

0.031

  Neutrophils (%)

71.0 ± 9.6

64.0 ± 13.7

< 0.001

66.8 ± 12.1

62.0 ± 13.0

0.058

  Absolute neutrophil count × 103/µL

5.5 ± 3.0

6.2 ± 5.2

0.290

4.5 ± 1.5

5.5 ± 3.1

0.011

  Lymphocytes (%)

20.4 ± 7.2

25.8 ± 11.8

< 0.001

23.9 ± 10.0

27.5 ± 11.4

0.106

  Absolute lymphocyte count × 103/µL

1.0 ± 0.4

1.3 ± 1.0

< 0.001

1.0 ± 0.5

1.3 ± 0.6

0.020

 Platelet × 103/µL

208.2 ± 50.0

298.2 ± 100.9

< 0.001

219.3 ± 72.9

286.3 ± 89.9

< 0.001

 ESR (mm/hr)

34.2 ± 15.8

36.2 ± 18.5

0.392

32.8 ± 15.6

36.5 ± 18.9

0.303

 CRP (mg/L)

68.4 ± 67.3

29.6 ± 33.9

< 0.001

57.9 ± 53.1

27.7 ± 25.9

0.004

 Procalcitonin (ng/mL)

0.7 ± 1.4

0.5 ± 1.8

0.512

1.3 ± 2.3

0.5 ± 1.8

0.261

Other laboratory data

 LDH (IU/L)

379.0 ± 147.6

334.4 ± 85.5

0.020

407.3 ± 139.9

328.9 ± 71.5

0.005

 AST (IU/L)

43.1 ± 22.2

38.7 ± 37.3

0.346

46.2 ± 23.1

35.1 ± 11.2

0.013

 ALT (IU/L)

17.4 ± 11.6

25.8 ± 71.6

0.351

23.2 ± 16.6

16.2 ± 10.9

0.030

Concurrent respiratory virus (n, %)

13 (24.1)

125 (33.7)

0.158

7 (39.2)

43 (27.4)

0.856

Oxygen requirement (n, %)

4 (6.2)

9 (2.1)

0.075

2 (6.5)

3 (1.6)

0.152

Radiologic grouping (n, %)

 Group 1

3 (4.6)

112 (25.7)

< 0.001

3 (9.7)

54 (29.3)

< 0.001

 Group 2

18 (27.7)

194 (44.5)

 

6 (19.4)

86 (46.7)

 

 Group 3

33 (50.8)

126 (28.9)

 

17 (54.8)

42 (22.8)

 

 Group 4

11 (16.9)

4 (0.9)

 

5 (16.1)

2 (1.1)

 

Pleural effusion (n, %)

19 (29.2)

34 (7.8)

< 0.001

9 (29.0)

16 (8.7)

0.003

Radiologic aggravation on the 3rd or 4th hospital day (n, %)

59 (90.8)

108 (24.8)

< 0.001

25 (80.6)

34 (18.5)

< 0.001

Fever profiles

 Highest temperature (°C)

39.6 ± 0.6

38.7 ± 0.7

< 0.001

39.4 ± 0.6

38.7 ± 0.7

< 0.001

 Lowest temperature (°C)

37.0 ± 0.3

36.6 ± 0.3

< 0.001

36.9 ± 0.3

36.6 ± 0.3

< 0.001

 Frequency of fever > 39 °C within 48 h (n)

3.3 ± 2.8

0.7 ± 1.4

< 0.001

2.9 ± 1.7

0.6 ± 1.2

< 0.001

 Frequency of fever > 40 °C within 48 h (n)

0.5 ± 1.0

0.1 ± 0.3

< 0.001

0.3 ± 0.6

0.0 ± 0.2

0.070

 Frequency of peak fever within 24 h (n)

4.7 ± 1.2

2.9 ± 1.4

< 0.001

4.6 ± 1.0

2.8 ± 1.3

< 0.001

 Frequency of peak fever within 48 h (n)

8.7 ± 1.7

4.6 ± 2.7

< 0.001

8.6 ± 1.7

4.5 ± 2.6

< 0.001

12 sequential body temperatures

 Initial (°C)

38.6 ± 0.9

37.9 ± 0.9

< 0.001

38.2 ± 0.9

37.9 ± 0.9

0.100

 After 4 h (°C)

38.1 ± 0.9

37.6 ± 0.8

< 0.001

38.0 ± 0.9

37.6 ± 0.7

0.008

 After 8 h (°C)

37.9 ± 0.8

37.4 ± 0.9

< 0.001

38.0 ± 1.1

37.5 ± 0.8

0.016

 After 12 h (°C)

37.9 ± 0.9

37.4 ± 0.9

< 0.001

38.0 ± 1.0

37.4 ± 0.8

< 0.001

 After 16 h (°C)

38.0 ± 1.0

37.4 ± 0.8

< 0.001

38.0 ± 0.9

37.3 ± 0.8

< 0.001

 After 20 h (°C)

38.2 ± 0.9

37.4 ± 0.7

< 0.001

38.2 ± 0.6

37.4 ± 0.8

< 0.001

 After 24 h (°C)

38.0 ± 0.6

37.4 ± 0.7

< 0.001

38.2 ± 0.6

37.5 ± 0.7

< 0.001

 After 28 h (°C)

38.3 ± 1.0

37.5 ± 0.8

< 0.001

37.9 ± 0.7

37.4 ± 0.7

< 0.001

 After 32 h (°C)

37.7 ± 1.0

37.0 ± 2.4

0.040

37.9 ± 1.0

37.2 ± 0.7

0.001

 After 36 h (°C)

37.9 ± 0.9

37.1 ± 0.7

< 0.001

37.6 ± 0.7

37.1 ± 0.8

0.001

 After 40 h (°C)

38.1 ± 0.9

37.1 ± 0.7

< 0.001

37.9 ± 0.9

37.0 ± 0.7

< 0.001

 After 44 h (°C)

38.1 ± 0.8

37.1 ± 0.7

< 0.001

37.8 ± 0.8

37.1 ± 0.7

< 0.001

  1. Continuous variables are presented as mean ± standard deviation
  2. Categorical variables are presented as frequencies (%)
  3. ESR Erythrocyte sedimentation rate, CRP C-reactive protein, LDH Lactate dehydrogenase, AST Aspartate aminotransferase, ALT Alanine aminotransferase, WBC White blood cell