Table 2 Odds ratios and predictive values for the presence of group A streptococci or any bacterial finding among patients with a sore throat (n = 220)

No coryza

2.8 (1.5–5.4)^††

–

41 (37–46)

87 (79–92)

97 (88–100)

3.2 (1.8–5.6)^†††

–

58 (52–63)

70 (61–77)

90 (75–97)

No cough

4.4 (2.2–8.8)^†††

6.0 (2.5–14)^†††

41 (36–46)

86 (79–92)

97 (88–100)

3.1 (1.7–5.4)^†††

2.7 (1.4–5.1)^††

58 (52–63)

69 (61–77)

90 (74–97)

Temperature ≥ 38.5 °C

2.7 (1.4–5.1)^††

1.4 (0.60–3.1)

38 (33–43)

79 (71–86)

96 (86–100)

2.1 (1.2–3.7)^††

1.5 (0.76–2.8)

54 (48–59)

61 (53–69)

88 (70–97)

Lymphadenitis

1.7 (0.90–3.1)

1.6 (0.71–3.4)

34 (29–39)

74 (66–81)

96 (83–100)

1.6 (0.93–2.8)

1.2 (0.65–2.3)

51 (45–56)

56 (48–64)

86 (65–96)

Tonsillar coating

3.1 (1.7–5.8)^†††

3.5 (1.5–8.0)^††

43 (35–51)

76 (70–81)

97 (88–100)

3.0 (1.7–5.4)^†††

2.5 (1.3–4.7)^††

62 (53–70)

59 (53–64)

92 (77–98)

Palatal petechiae

1.2 (0.48–2.9)

–

32 (18–51)

68 (66–70)

95 (54–100)

1.4 (0.59–3.1)

–

52 (34–69)

51 (48–53)

87 (41–98)

Duration ≤ 3 days

1.9 (1.1–3.5)^†

1.4 (0.65–3.0)

38 (31–45)

74 (68–80)

96 (85–100)

1.9 (1.10–3.3)^†

1.3 (0.69–2.5)

55 (48–62)

57 (51–63)

89 (69–97)

Age, years

1.09 (1.05–1.13)^†††

1.12 (1.07–1.18)^†††

–

–

–

1.02 (0.99–1.05)

1.02 (0.99–1.06)

–

–

–

Centor 3–4

4.5 (2.4–8.3)^†††

–

49 (42–57)

82 (77–87)

98 (91–100)

3.6 (2.0–6.4)^†††

–

66 (57–74)

65 (60–70)

94 (81–99)

Centor 3–4 + positive RADT

5.8 (1.4–24)^†

–

93 (81–97)

97 (84–100)

–

–

–

–

–

–

Centor 0^a

1

–

13 (3–38)

69 (67–70)

1

–

25 (10–50)

51 (50–53)

Centor 1

0.96 (0.17–5.3)

–

12 (6–23)

65 (62–68)

0.95 (0.26–3.5)

–

24 (15–36)

47 (43–50)

Centor 2

2.1 (0.43–10)

–

23 (16–33)

67 (63–71)

2.4 (0.72–8.3)

–

45 (36–55)

52 (48–57)

Centor 3

5.6 (1.2–27)^†

–

44 (34–56)

75 (71–78)

5.5 (1.6–20)^††

–

65 (53–75)

59 (55–63)

Centor 4

9.7 (1.9–50)^††

–

58 (42–73)

75 (72–77)

6.3 (1.6–25)^††

–

68 (51–81)

57 (54–59)