Table 3 Effect of demographic and clinical characteristics on laboratory-confirmed influenza type

Age group (years)

<=1

2 to 4

0.6

0.4 - 1.0

0.6

0.4 - 1.0

5 to 9

0.4

0.2 - 0.6

0.5

0.3 - 0.9

10 to 14

0.3

0.2 - 0.4

0.4

0.3 - 0.7

15 to 24

0.5

0.3 - 0.8

0.8

0.5 - 1.3

25 to 44

0.7

0.5 - 1.1

1.0

0.6 - 1.6

45 to 64

1.1

0.7 - 1.7

1.5

0.9 - 2.5

65 to 74

2.7

1.2 - 6.2

3.1

1.3 - 7.3

75+

2.0

1.4 - 2.8

2.4

1.5 - 3.7

Female

1.0

0.8 - 1.2

0.8

0.7 - 1.0

Resides in an urban area

1.6

1.3 - 1.9

1.3

1.1 - 1.7

Income quintiles

Q1 (lowest)

Q2

0.9

0.7 - 1.3

1.0

0.7 - 1.5

Q3

0.6

0.4 - 0.8

0.6

0.5 - 0.9

Q4

0.7

0.5 - 1.1

0.9

0.6 - 1.4

Q5 (highest)

0.8

0.5 - 1.2

1.0

0.6 - 1.5

Unknown

1.5

1.0 - 2.2

1.0

0.6 - 1.5

Asthma

0.9

0.6 - 1.2

0.9

0.6 - 1.3

Any cardiovascular disease

2.2

1.7 - 2.8

0.8

0.5 - 1.1

Chronic obstructive pulmonary disease

1.9

1.3 - 2.6

1.3

0.9 - 1.9

Diabetes

2.2

1.4 - 3.6

1.2

0.7 - 2.0

Immunosuppressed

1.4

1.0 - 1.9

0.8

0.6 - 1.2

Any chronic disease

1.7

1.3 - 2.1

1.0

0.7 - 1.3

Charlson index

1.3

1.1 - 1.4

1.1

1.0 - 1.2

Any hospital admissions in last 5 years

2.2

1.8 - 2.8

1.7

1.3 - 2.3

Had ≥37 physician visits in last 5 years

1.9

1.5 - 2.4

1.0

0.8 - 1.4

Received the seasonal influenza vaccine

1.2

0.9 - 1.7

0.6

0.4 - 0.9

Received a pneumococcal vaccine

1.7

1.3 - 2.1

0.9

0.7 - 1.2