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Oregon EPHT Asthma Hospitalizations

Asthma Indicator:   Hospitalizations

Measure : Average daily number of hospitalizations

 

Data used in the calculation of these measures were collected by the Oregon Association of Hospitals and Health Systems for the Hospital Discharge Index (HDI). The HDI provides a central database of all Oregon hospital discharges for public health surveillance and hospital policy analysis. Information on emergency room visits, urgent care, outpatient surgery and clinic visits is not included in this database.

 

Tracking asthma hospitalizations will let Oregon EPHT  look more closely at the relationship between asthma and indoor and outdoor pollutants by examining trends, geographic or demographic differences, and targeting interventions to those most in need of care.   EPHT can also assist in monitoring the burden of asthma, asthma trends and how asthma affects the quality of life.

 

The tables and graph below show the average number of daily hospitalizations for a given calendar month by year and county. There are similar trends across Oregon's counties and over the last several years: Asthma hospitalizations were most frequent in winter and early spring and least frequent in the summer months. This pattern is commonly observed in the United States as well as other parts of the world, and it can be related to factors that exacerbate asthma, such as infections or allergies.

 

The highest numbers of hospitalizations occurred in the period from November through March, which comprises the flu season in North America. The common cold also occurs most frequently during this period. Both the flu and the common cold can trigger asthma attacks because they irritate the air passages and heighten the body’s response to other allergens and pollutants. Respiratory infections can, therefore, at least partly explain the increased asthma hospitalization rate during the cold season.

 

The relatively sharp increase in September, also known as the September epidemic of asthma hospitalizations, has also been linked to respiratory infections; in September, children return to school, where they are more likely to get an infection and to transmit it to their siblings or parents. As a result, asthma attacks resulting in hospitalizations suddenly increase in frequency.

 

The high number of hospitalizations in spring is probably due to the beginning of the tree pollen season. Pollen can trigger an allergic reaction that, in the case of asthma, affects the lungs and brings about asthma symptoms. The start of the pollen season can overlap with the end of the flu season, leading to a particularly high susceptibility to asthma attacks and subsequent asthma hospitalizations.

  

Table 1:   Average daily number of asthma hospitalizations from 2000 to 2006, by year and month

 

Table 2:  Average daily number of asthma hospitalizations, averaged from 2000 to 2006, by county and month 

 

Graph 1:  Average daily number of hospitalizations in Oregon, averaged from 2000 to 2006, by month 

 

 

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Table 1:  Average daily number of asthma hospitalizations from 2000 to 2006, by year and month

 

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

2000

8.8

7.9

7.2

6.5

4.4

4.2

4

3.8

7

6.8

7.6

6.1

2001

6.6

8.4

8.9

7.8

6.3

5.1

4.2

4.4

4.8

6.8

5.9

5.4

2002

7.3

9.2

9.7

7.3

5.6

6.3

3.6

4.9

7.8

6.9

7.7

7.4

2003

6.8

8.8

8.8

8

7.1

5.5

3.9

4.1

6.1

5.7

6.2

10.4

2004

5.7

8.3

6.9

5.6

5.6

5.9

3.6

3.5

6.2

5.8

6.9

6.8

2005

8.2

10.9

9

8

7

5.8

3.7

3.1

6.1

7

6.1

5.9

2006

6.9

7.2

8.2

7.2

5.5

5

3.7

3.2

6.3

6.2

6.5

6.4

___________________________________________________________________________________________________

Table 2:  Average daily number of asthma hospitalizations, averaged from 2000 to 2006, by county and month

 

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Oregon

7.18

8.64

8.38

7.19

5.94

5.40

3.83

3.85

6.32

6.46

6.71

6.89

Baker

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Benton

0.1

0.1

0.1

0.1

0.1

0.0

0.0

0.0

0.1

0.1

0.1

0.1

Clackamas

0.5

0.7

0.6

0.5

0.4

0.4

0.3

0.3

0.5

0.5

0.5

0.5

Clatsop

0.1

0.1

0.1

0.1

0.1

0.0

0.1

0.1

0.1

0.1

0.1

0.1

Columbia

0.1

0.1

0.2

0.1

0.0

0.1

0.1

0.0

0.1

0.1

0.1

0.1

Coos

0.2

0.3

0.3

0.3

0.2

0.2

0.1

0.2

0.2

0.2

0.3

0.3

Crook

0.0

0.1

0.1

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.1

0.0

Curry

0.1

0.1

0.1

0.1

0.0

0.1

0.0

0.0

0.0

0.0

0.0

0.1

Deschutes

0.2

0.3

0.3

0.3

0.1

0.1

0.1

0.1

0.2

0.3

0.2

0.2

Douglas

0.4

0.4

0.4

0.4

0.3

0.2

0.3

0.1

0.3

0.3

0.3

0.4

Gilliam

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Grant

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Harney

0.0

0.0

0.1

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.1

0.0

Hood River

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Jackson

0.5

0.5

0.5

0.4

0.4

0.4

0.2

0.3

0.4

0.4

0.4

0.5

Jefferson

0.1

0.1

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.1

0.1

0.1

Josephine

0.2

0.3

0.2

0.2

0.2

0.1

0.1

0.1

0.2

0.2

0.2

0.2

Klamath

0.1

0.2

0.2

0.2

0.1

0.1

0.1

0.2

0.1

0.2

0.1

0.2

Lake

0.0

0.0

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.1

Lane

0.5

0.6

0.6

0.6

0.4

0.5

0.3

0.2

0.5

0.4

0.7

0.6

Lincoln

0.1

0.1

0.1

0.1

0.0

0.1

0.0

0.1

0.1

0.1

0.1

0.1

Linn

0.3

0.3

0.4

0.4

0.3

0.2

0.1

0.2

0.2

0.2

0.2

0.2

Malheur

0.0

0.0

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Marion

0.4

0.5

0.6

0.4

0.3

0.4

0.2

0.2

0.3

0.4

0.4

0.5

Morrow

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Multnomah

1.6

1.9

1.8

1.5

1.3

1.2

0.9

0.9

1.5

1.5

1.5

1.4

Polk

0.1

0.1

0.1

0.1

0.1

0.1

0.0

0.0

0.1

0.1

0.1

0.1

Sherman

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Tillamook

0.1

0.1

0.1

0.1

0.1

0.0

0.1

0.1

0.1

0.1

0.1

0.1

Umatilla

0.1

0.2

0.2

0.1

0.1

0.1

0.0

0.1

0.1

0.1

0.1

0.1

Union

0.1

0.1

0.1

0.0

0.1

0.0

0.0

0.0

0.1

0.0

0.1

0.1

Wallowa

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Wasco

0.1

0.1

0.1

0.1

0.1

0.0

0.1

0.0

0.1

0.1

0.1

0.1

Washington

0.7

1.0

0.9

0.8

0.7

0.6

0.3

0.3

0.6

0.6

0.6

0.6

Wheeler

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

Yamhill

0.2

0.2

0.2

0.2

0.1

0.2

0.1

0.1

0.1

0.2

0.2

0.1

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Graph 1:  Average  daily number of hospitalizations in Oregon, averaged from 2000 to 2006, by month

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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