Table 4 The accuracy of influenza coding (ICD10 +) among patients with PCR + : A sub-group analysis by selected characteristics and test result availability

Type of laboratory test

 Rapid PCR^b

2.1 (1.3–3.5); P = 0.01

20

6

30.0 (11.9–54.3)

1.6 (0.4–6.4); P = 0.46

 Multiplex PCR

Ref

289

95

32.9 (27.5–38.6)

Ref

Season

 Influenza

1.5 (1.0–2.3); P = 0.04

220

67

30.5 (24.4–37.0)

0.7 (0.4–1.2); P = 0.19

 Non-influenza

Ref

89

34

38.2 (28.1–49.1)

Ref

Hospital

 A

4.1 (2.0–8.5); P < 0.01

121

32

26.4 (18.8–35.2)

0.5 (0.2–1.4); P = 0.20

 B

1.6 (0.8–3.3); P = 0.16

94

29

30.9 (21.7–41.2)

0.6 (0.2–1.5); P = 0.28

 C

3.1 (1.4–6.6); P < 0.01

39

19

48.7 (32.4–65.2)

1.2 (0.5–3.2); P = 0.69

 D

3.7 (1.5–9.3); P < 0.01

10

2

20.0 (2.5–55.6)

0.2 (0.03–1.8); P = 0.17

 E

2.3 (0.8–6.3); P = 0.12

5

1

20.0 (0.5–71.6)

0.2 (0.02–3.6); P = 0.30

 F

12.9 (1.6–106.7); P = 0.02

–

–

–

–

 G

Ref

40

18

45.0 (29.3–61.5)

Ref

Setting where the test was ordered

 ED^c

1.4 (0.9–2.0); P = 0.06

192

69

35.9 (29.2–43.2)

1.9 (1.1–3.5); P = 0.03

 Inpatient

Ref

117

32

27.4 (19.5–36.4)

Ref