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Table 1 Hospital admissions with either clinical diagnosis or diagnosis of influenza (ICD-9487 and 488), 2009–2010 to 2014–2015 seasons

From: Inpatient hospital fatality related to coding (ICD-9-CM) of the influenza diagnosis in Spain (2009–2015)

Age group Years (y.)

Number of admissions (%)

Average annual incidence × 100,000 people (95% CI)

Number of Deaths (%)

Mortality rate ×  100,000 people (95% CI)

Fatality (%)

(95% CI)

 

487

488

All

487

488

All

487

488

All

487

488

All

487

488

All

<  5 y.

4543 18.5%

4059 14.3%

8602 16.3%

31.8 (30.8–32.7)

28.4 (27.5–29.2)

60.1 (58.86–61.4)

15 1.5%

27 1.7%

42 1.7%

0.1 (0.05–0.16)

0.19 (0.12–0.26)

0.29 (0.2–0.38)

0.3 (0.2–0.5)

0.7 (0.4–0.9)

0.5 (0.34–0.64)

5–14 y.

1461 6%

1525 5.4%

2986 5.6%

5.3 (5–5.5)

5.5 (5.2–5.8)

10.7 (10.34–11.11)

16 1.6%

15 1%

31 1.2%

0.06 (0.03–0.09)

0.05 (0.03–0.08)

0.11 (0.07–0.15)

1.1 (0.7–1.6)

1.0 (0.5–1.5)

1.0 (0.67–1.4)

15–44 y.

3658 14.9%

6985

24.6%

10,643 20.1%

3.1 (3–3.2)

6.0 (5.8–6.1)

9.1 (8.92–9.26)

58 5.9%

230 14.8%

288 11.3%

0.05 (0.04–0.06)

0.2 (0.17–0.22)

0.25 (0.22–0.27)

1.6 (1.2–2)

3.3 (2.9–3.7)

2.7 (2.4–3.01)

45–64 y.

4652 19%

7479

26.4%

12,131

22.9%

6.4 (6.2–6.5)

10.2 (10–10.5)

16.6 (16.29–16.88)

176 17.8%

480 30.9%

656 25.8%

0.24 (0.21–0.28)

0.66 (0.6–0.71)

0.9 (0.83–0.97)

3.8 (3.2–4.3)

6.4 (5.9–7)

5.4 (5.01–5.81)

Over 65 y.

10,213 41.6%

8309

29.3%

18,522

35%

20.6 (20.2–21)

16.8 (16.3–17.1)

37.3 (36.81–37.88)

725 73.2%

803 51.6%

1528 60%

1.46 (1.36–1.57)

1.62 (1.51–1.73)

3.08 (2.93–3.24)

7.1 (6.6–7.6)

9.7 (9–10.3)

8.6 (7.85–8.65)

Over 75 y.

6923 28.2%

5056

17.8%

11,979

22.7%

27.3 (26.6–27.9)

19.9 (19.4–20.5)

47.2 (46.33–48.02)

549 55.5%

527 33.9%

1076 42.3%

2.16 (1.98–2.34)

2.08 (1.9–2.25)

4.24 (3.98–4.49)

7.9 (7.3–8.6)

10.4 (9.6–11.3)

9.0 (8.47–9.49)

Over 85 y.

2492 10.2%

1587

5.6%

4079

7.7%

35.4 (34–36.8)

22.5 (21.4–23.7)

57.9 (56.16–59.71)

262 26.5%

193 12.4%

455 17.9%

3.72 (3.27–4.17)

2.74 (2.35–3.13)

6.46 (5.87–7.06)

10.5 (9.3–11.7)

12.2 (10.6–13.8)

11.2 (10.19–12.12)

Total

24,527 100%

28,357

100%

52,884

100%

8.7 (8.6–8.8)

10.1 (9.9–10.2)

18.8 (18.59–18.91)

990 100%

1555 100%

2545 100%

0.35 (0.33–0.37)

0.55 (0.52–0.58)

0.9 (0.87–0.94)

4.0 (3.8–4.3)

5.5 (5.2–5.8)

4.8 (4.63–4.99)