Table 2 Diagnostic value of warning signs at admission according to dengue severity

 Abdominal pain

9

44

45.0

(23.1–68.5)

58.1

(48.1–67.7)

17.0

(8.1–29.8)

84.7

(74.3–92.1)

1.1

(0.6–1.8)

0.9

(0.6–1.4)

 Persistent vomiting

8

12

40.0

(19.1–64.0)

88.6

(80.9–94.0)

40.0

(19.1–64.0)

88.6

(80.9–94.0)

3.5

(1.6–7.4)

0.7

(0.5–1.0)

 Clinical fluid accumulation

15

10

75.0

(50.9–91.3)

90.5

(83.2–95.3)

60.0

(38.7–78.9)

95.0

(88.7–98.4)

7.9

(4.2–15.0)

0.3

(0.1–0.6)

 Lethargy

18

76

90.0

(68.3–98.8)

27.6

(19.3–37.2)

19.2

(11.8–28.6)

93.6

(78.6–99.2)

1.2

(1.0–1.5)

0.4

(0.1–1.4)

 Liver span of >15 cm

12

17

60.0

(36.0–80.9)

83.8

(75.4–90.3)

41.4

(23.5–61.1)

91.7

(84.2–96.3)

3.7

(2.1–6.5)

0.5

(0.3–0.8)

 Mucosal bleeding

14

39

70.0

(45.7–88.1)

62.9

(52.9–72.1)

26.4

(15.3–40.3)

91.7

(82.7–96.9)

1.9

(1.3–2.8)

0.5

(0.2–1.0)

 Hematocrit >2 % and platelets ≤100 × 10³/μL

12

42

60.0

(36.0–80.9)

60.0

(50.0–69.4)

22.2

(12.0–35.6)

88.7

(79.0–95.0)

1.5

(1.0–2.3)

0.7

(0.4–1.2)

  ≥ 1

20

95

100.0

(83.2–100.0)

9.5

(4.7–16.8)

17.4

(11.0–25.6)

100.0

(69.2–100.0)

1.1

(1.0–1.2)

0

  ≥ 2

19

71

95.0

(75.1–99.9)

32.4

(23.6–42.1)

21.1

(13.2–31.0)

97.1

(85.1–99.9)

1.4

(1.2–1.7)

0.2

(0–1.1)

  ≥ 3

17

43

85.0

(62.1–96.8)

59.0

(49.0–68.6)

28.3

(17.4–41.4)

95.4

(87.1–99.0)

2.1

(1.6–2.8)

0.2

(0.1–0.7)

  ≥ 4

14

21

70.0

(45.7–88.1)

80.0

(71.1–87.2)

40.0

(23.9–57.9)

93.3

(86.0–97.5)

3.5

(2.2–5.6)

0.4

(0.2–0.7)

  ≥ 5

11

8

55.0

(31.5–76.9)

92.4

(85.5–96.6)

57.9

(33.5–79.8)

91.5

(84.5–96.0)

7.2

(3.3–15.7)

0.5

(0.3–0.8)

  ≥ 6

5

2

25.0

(8.7–49.1)

98.1

(93.3–99.8)

71.4

(29.0–96.3)

87.3

(79.9–92.7)

13.1

(2.7–63.0)

0.8

(0.6–1.0)