Table 2 The difference of clinical characteristics based on different duration of hospitalization

Total No.

651

349

151

Age

644

345

< 0.001

150

< 0.001

< 0.001

 < 3 m

3(0.46)

6(1.74)

3(2.00)

 3 m−1y

72(11.18)

102(29.56)

64(42.67)

 1−2y

125(19.41)

93(26.96)

44(29.33)

 2−5y

327(50.78)

111(32.17)

33(22.00)

 ≥ 5y

117(18.17)

33(9.57)

6(4.00)

X-ray

439

305

< 0.001

148

< 0.001

< 0.001

 Normal

201(45.78)

47(15.41)

5(3.38)

 ^aOne side

64(14.58)

53(17.38)

6(4.05)

 ^bBoth side

174(39.64)

205(67.21)

137(92.57)

High fever(≥ 39°C)

651

349

< 0.001

151

< 0.001

< 0.001

297(45.62)

256(73.35)

127(84.11)

Blood system

Abnormal RBC count

150(24.47)

98(28.74)

0.423

49(35.58)

0.022

0.064

Abnormal Hb

174(28.20)

118(34.50)

0.309

57(44.88)

0.013

0.041

Abnormal WBC count

187(30.21)

114(33.33)

0.648

57(47.24)

0.013

0.029

Abnormal Neutrophil(%)

214(34.63)

168(49.12)

0.045

83(65.87)

< 0.001

< 0.001

Abnormal lymphocyte(%)

150(24.35)

94(27.49)

0.626

63(50.50)

< 0.001

< 0.001

Abnormal CRP

571(98.45)

332(98.52)

0.561

122(97.60)

1

0.816

Liver function

Abnormal AST

115(18.91)

133(39.12)

< 0.001

81(54.36)

< 0.001

< 0.001

Abnormal ALT

58(9.54)

37(10.88)

0.509

35(23.49)

< 0.001

< 0.001

Kidney function

Abnormal Creatinine

2(0.33)

4(1.18)

0.113

1(0.67)

0.553

0.288

Abnormal Urea

50(8.20)

34(10.00)

0.348

15(10.00)

0.479

0.583

Abnormal Albumin

126(20.59)

112(32.75)

< 0.001

79(52.67)

< 0.001

< 0.001

Myocardial injury

Abnormal TnI

14(2.35)

19(5.78)

0.149

28(24.56)

< 0.001

< 0.001

Abnormal CKMB

49(8.24)

30(9.09)

0.800

16(14.04)

0.175

0.328

Abnormal BNP

6(1.76)

5(2.87)

0.651

6(8.96)

0.030

0.040

Blood gas analysis

Abnormal PH

66(47.48)

49(38.28)

0.198

50(46.73)

1.000

0.334

Abnormal PaO₂

102(73.38)

88(68.75)

0.533

91(85.05)

0.037

0.023

Abnormal SPO₂

21(15.11)

17(13.28)

0.684

31(28.97)

0.017

0.007