Table 2 Incidence rates (per 100,000 patient-years) of influenza and incidence rate ratios adjusted for baseline characteristics in patient subgroups

18–29

495.81

336.70

534.54

444.42

522.13

409.48

1.72 (0.50, 5.94)

1.54 (0.70, 3.38)

1.57 (0.81, 3.03)

30–39

761.26

347.99

633.31

387.97

670.90

375.64

2.07 (0.97, 4.38)

1.54 (0.93, 2.54)

1.65 (1.09, 2.51)

40–49

521.10

379.23

515.93

498.87

517.57

459.64

1.06 (0.62, 1.82)

0.88 (0.62, 1.24)

0.92 (0.69, 1.24)

50–59

358.50

245.10

381.06

357.66

373.58

319.45

1.38 (0.83, 2.32)

0.94 (0.68, 1.30)

1.06 (0.80, 1.38)

60–69

299.32

106.51

366.56

200.68

342.11

165.94

2.44 (1.13, 5.26)

1.75 (1.11, 2.76)

1.94 (1.31, 2.86)

≥70

309.20

238.81

314.97

252.78

312.93

247.95

0.97 (0.48, 1.96)

0.97 (0.58, 1.62)

0.98 (0.64, 1.48)

Overall

393.91

245.31

417.18

337.69

409.33

306.12

1.43 (1.09, 1.88)

1.13 (0.95, 1.35)

1.22 (1.05, 1.41)

18–29

70.05

0

0

0

22.45

0

–

–

–

30–39

57.49

0

71.98

0

67.71

0

–

–

–

40–49

38.61

32.78

71.96

31.89

61.36

32.18

0.45 (0.06, 3.44)

1.45 (0.43, 4.93)

1.10 (0.39, 3.07)

50–59

59.28

19.50

55.02

20.01

56.43

19.84

1.39 (0.26, 7.46)

2.06 (0.65, 6.47)

1.83 (0.71, 4.69)

60–69

59.53

35.44

63.02

13.79

61.76

21.77

1.08 (0.25, 4.70)

3.17 (0.67, 14.97)

2.15 (0.77, 6.0)

≥70

180.81

79.38

122.12

50.39

142.86

60.42

1.18 (0.39, 3.63)

1.76 (0.65, 4.74)

1.50 (0.71, 3.14)

Overall

80.28

34.08

71.95

23.55

74.76

27.15

1.30 (0.64, 2.63)

2.17 (1.22, 3.86)

1.82 (1.16, 2.81)

18–29

541.94

343.41

609.33

456.87

587.11

419.88

1.72 (0.50, 5.49)

1.54 (0.71, 3.38)

1.57 (0.81, 3.04)

30–39

804.93

352.17

670.75

377.68

710.76

369.80

2.07 (0.97, 4.38)

1.61 (0.97, 2.68)

1.71 (1.12, 2.61)

40–49

516.81

383.82

526.27

490.36

523.19

455.34

1.08 (0.63, 1.85)

0.90 (0.63, 1.28)

0.94 (0.70, 1.27)

50–59

387.17

247.13

399.08

358.47

395.08

320.48

1.38 (0.82, 2.31)

0.95 (0.69, 1.32)

1.06 (0.81, 1.40)

60–69

354.97

107.65

413.55

203.48

391.99

168.05

2.42 (1.12, 5.25)

1.81 (1.14, 2.86)

1.97 (1.33, 2.91)

≥70

304.73

240.80

270.23

238.58

282.70

239.35

0.93 (0.45, 1.92)

0.99 (0.57, 1.70)

0.96 (0.62, 1.49)

Overall

426.42

247.82

437.87

333.77

433.96

304.30

1.44 (1.09, 1.89)

1.17 (0.98, 1.40)

1.25 (1.07, 1.45)

18–29

76.49

0

0

0

25.21

0

0

–

–

30–39

60.73

0

77.64

0

72.59

0

0

–

–

40–49

41.40

33.17

79.96

32.39

67.40

32.64

0.46 (0.06, 3.44)

1.45 (0.43, 4.93)

1.10 (0.39, 3.07)

50–59

65.34

19.66

57.68

20.35

60.25

20.11

1.39 (0.26, 7.46)

1.98 (0.62, 6.27)

1.77 (0.69, 4.56)

60–69

68.26

35.82

72.71

13.98

71.07

22.04

1.02 (0.23, 4.55)

3.56 (0.76, 16.66)

2.13 (0.76, 6.01)

≥70

145.29

80.04

112.16

42.47

124.13

55.49

0.99 (0.30, 3.28)

1.83 (0.62, 5.35)

1.40 (0.63, 3.08)

Overall

76.64

34.43

74.20

22.41

75.03

26.53

1.23 (0.59, 2.51)

2.23 (1.23, 4.03)

1.76 (1.12, 2.77)

<65

49.38

31.92

90.34

34.93

76.75

33.91

1.00 (0.40, 2.45)

2.20 (1.26, 3.85)

1.78 (1.11, 2.85)

≥65

134.89

29.83

141.59

47.02

139.25

41.10

1.66 (0.44, 6.26)

2.12 (0.96, 4.68)

2.01 (1.02, 3.95)

Overall

76.22

31.33

105.54

38.34

95.66

35.95

1.15 (0.55, 2.41)

2.15 (1.36, 3.38)

1.84 (1.25, 2.70)

<65

52.46

11.97

32.09

18.48

38.83

16.27

3.03 (0.85, 10.83)

1.27 (0.56, 2.90)

1.72 (0.87, 3.40)

≥65

87.68

19.90

101.67

47.03

96.78

37.68

2.11 (0.42, 10.50)

1.55 (0.68, 3.50)

1.68 (0.82, 3.47)

Overall

63.52

14.24

52.70

26.53

56.34

22.34

2.69 (1.0, 7.28)

1.37 (0.77, 2.44)

1.69 (1.02, 2.75)