Table 3 Results of subgroup analysis stratified by independent variables ^{a, b}

Sex

 Men

1.00

1.07

(1.04

–

1.10)

1.08

(1.04

–

1.11)

1.14

(1.11

–

1.18)

2.95

(2.86

–

3.04)

 Women

1.00

1.13

(1.10

–

1.16)

1.12

(1.09

–

1.15)

1.21

(1.17

–

1.25)

3.55

(3.45

–

3.66)

Influenza vaccination

 Yes

1.00

1.14

(1.10

–

1.17)

1.12

(1.09

–

1.16)

1.20

(1.16

–

1.24)

3.25

(3.15

–

3.36)

 No

1.00

1.08

(1.05

–

1.11)

1.09

(1.06

–

1.12)

1.15

(1.11

–

1.18)

3.17

(3.08

–

3.27)