Table 1 Characteristics of the pediatric patients with MP pneumonia (n = 199)

 Male, n (%)

28 (51.0)

31 (62.0)

0.253

20 (45.0)

16 (32.0)

0.181

 Female, n (%)

27 (49.0)

19 (38.0)

24 (55.0)

34 (68.0)

 Low titer, n (%)

35 (63.6)

26(52.0)

0.227

28 (63.6)

25 (50.0)

0.183

 High titer, n (%)

20 (36.4)

24(48.0)

16 (36.4)

25 (50.0)

 Age, median (IQR) (Months)

50 (18,84)

50.5 (38.8,70.0)

0.717

64.5 (25.5,96.0)

60.5(41.0,80.0)

0.883

WBC, median (IQR) (^10⁹/L)

8.70 (6.4,10.7)

7.35 (6.48,9.13)

0.105

8.4 (6.7,11.3)

8.2 (6.18,9.38)

0.319

Neutrophil proportion (%)

53.46 ± 16.41

52.68 ± 16.78

0.810

52.26 ± 17.33

57.88 ± 13.06

0.083

Lymphocyte proportion (%)

38.00 ± 15.80

39.23 ± 16.31

0.695

38.69 ± 16.38

33.80 ± 13.03

0.111

MO proportion (IQR) (%)

6.90 (5.9,8.2)

5.90 (4.9.7.90)

0.139

6.5 (5.25,8.28)

6.7 (4.83,7.9)

0.471

Eosinophil proportion (IQR) (%)

0.50 (0.2,0.9)

0.60 (0.2,1.33)

0.203

0.75 (0.33,1.20)

0.7 (0.20,1.13)

0.276

Basophil proportion (IQR) (%)

0.30 (0.20, 0.90)

0.50 (0.30,1.00)

0.075

0.4 (0.2,0.6)

0.45 (0.3,0.7)

0.118

Neutrophil, median (IQR) (^10⁹/L)

4.40 (3.00,6.00)

4.00 (2.60,5.15)

0.175

4.4 (2.79,5.8)

4.25 (3.33,6.08)

0.625

Lymphocyte, median (IQR) (^10⁹/L)

2.80 (1.70,4.90)

2.95 (1.88,3.90)

0.790

3.19 (2.5,4.41)

2.8 (2.1,3.85)

0.150

MO, median (IQR) (10⁹/L)

0.6 (0.5,0.8)

0.4 (0.4,0.6)

0.003^*

0.6 (0.4,0.87)

0.4 (0.3,0.6)

0.008^*

Eosinophil, median (IQR) (^10⁹/L)

0.01 (0.00,0.10)

0.04 (0.00,0.10)

0.791

0.1 (0.00, 0.10)

0.06 (0.00,0.10)

0.273

Basophil, median (IQR) (^10⁹/L)

0.00 (0.00,0.04)

0.00 (0.00,0.10)

0.262

0.00 (0.00,0.04)

0.00 (0.00,0.10)

0.681

RBC count (^10¹²/L)

4.59 ± 0.41

4.52 ± 0.31

0.333

4.56 ± 0.42

4.59 ± 0.34

0.712

Hemoglobin (g/L)

127.40 ± 10.68

125.62 ± 9.50

0.371

125.05 ± 12.92

128.40 ± 9.18

0.147

Hematokrit (%)

37.88 ± 3.15

37.28 ± 2.63

0.295

37.39 ± 2.91

37.90 ± 2.54

0.365

MCV (fL)

82.90 ± 5.03

82.55 ± 3.79

0.695

82.65 ± 4.43

82.19 ± 6.15

0.684

MCH, median (IQR) (pg)

27.2 (26.35,28.70)

27.8 (27.05,29.05)

0.133

27.5 (26.48,28.28)

27.9 (27.1,28.9)

0.171

MCHC, median (IQR) (g/L)

331 (324,344)

335 (331,344)

0.071

336 (329.25,341)

338.5 (336,343)

0.054

RDW, median (IQR) (%)

12.0 (11.4,13.0)

11.5 (11.1,12.1)

0.002^*

11.9 (11.4,12.58)

11.4(10.9,11.93)

0.001^*

PLT (^10⁹/L)

290.13 ± 96.71

340.44 ± 89.79

0.007^*

297.95 ± 99.43

337.48 ± 86.91

0.043^*

PDW (fL)

17.34 ± 0.91

16.80 ± 1.00

0.004^*

17.23 ± 0.80

16.83 ± 0.80

0.017^*

MPV (fL)

5.35 ± 1.19

4.72 ± 0.99

0.004^*

5.09 ± 0.94

4.70 ± 0.82

0.035^*

PCT

0.16 ± 0.09

0.16 ± 0.04

0.878

0.16 ± 0.05

0.15 ± 0.04

0.245