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Table 1 Comparison of main characters of patients of primary and secondary dengue

From: Differentiating secondary from primary dengue using IgG to IgM ratio in early dengue: an observational hospital based clinico-serological study from North India

Characteristic

Total patients

Primary dengue

Secondary dengue

P value

N = 114

N = 38 (33.3%)

N = 76 (66.7%)

Sex % (n)

 Males

70.2% (80)

76.3% (29)

67.1% (51)

0.387

 Females

29.8% (34)

23.7% (9)

32.9% (25)

Age (mean ± SD), Years

38.52 ± 10.99

42.18 ± 11.64

36.68 ± 10.24

0.011

Max temp. (mean ± SD), Fahrenheit

101.2 ± 1.51

100.79 ± 1.25

101.56 ± 1.558

0.015

Platelet count (mean ± SD) × 103/micl

67.16 ± 45.31

100.45 ± 38.66

50.51 ± 38.91

<0.0001

IgM index (mean ± SD)

1.21 ± 0.85

1.45 ± 1.24

1.09 ± 0.55

0.032

IgG index (mean ± SD)

2.81 ± 1.92

0.30 ± 0.14

4.06 ± 0.88

<0.0001

Ig M D2 % (N)

51.8% (59)

44.7% (17)

55.3% (42)

0.324

IgM D7 % (N)

96.5% (110)

97.4% (37)

96.1 (73)

1.0

IgG % (N)

66.7% (76)

0%

100% (76)

<0.0001

IgG/ IgM (mean ± SD)

3.22 ± 2.91

0.34 ± 0.27

4.65 ± 2.53

<0.0001

Dengue fever %(n)

73.7% (84)

97.4% (37)

61.8 (47)

<0.0001

DHF/DSS % (N)

26.3% (30)

2.6% (1)

38.2% (29)

NS1 % (N)

90.4% (103)

92.1% (35)

89.5% (68)

0.749

  1. This table shows the characteristics of the patients studied and compares amongst the primary and secondary cases
  2. Abbreviations: N number, SD standard deviation, DHF dengue hemorrhagic fever, DSS dengue shock syndrome, NS1 nonstructural protein 1 antigen, Ig M D2 IgM done on day 2, Ig M D7 IgM done on day 7