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Table 3 Change in frequency of pneumonia cases per 1000 person-years from 2008 to 2009 to 2014

From: Trends in healthcare utilization and costs associated with pneumonia in the United States during 2008–2014

Age group

Frequency per 1000 person-years

Change (%)

P-value b

2008–2009 a

2014

<  1 y

34.6

22.5

−34.8

< 0.0001

1 y

51.4

39.9

−22.4

< 0.0001

2–4 y

40.9

33.9

−17.2

< 0.0001

5–17 y

15.9

12.8

−19.5

< 0.0001

18–49 y

8.6

6.8

−20.7

< 0.0001

50–64 y

15.0

13.1

−12.7

< 0.0001

65–74 y

29.4

26.4

−10.1

< 0.0001

75–84 y

53.4

52.6

−1.5

0.0054

≥ 85 y

89.1

95.7

+ 7.4

< 0.0001

Overall

16.1

13.5

−16.1

< 0.0001

  1. a Average for 2008 and 2009
  2. bP-value for change over time determined by Poisson regression analysis