Avon NHS  Avon NHS Search  NHS uk  NHS Direct
NHS logo
Public Health
Network
 


Main Menu



About the Network
Data & Literature
PCT Profiles
Health Protection Agency
Publications
Education, Training & CPD
Public Health Forums
Website Survey
Links
Search

Directly Age Standardised Rates

This is an example calculation of directly standardised mortality rates from Coronary heart disease in persons aged under 65. It is taken from  Department of Health, Compendium of Clinical Indicators 2000 (NHS only).  A template for calculating directly standardised rates is available on an excel spreadsheet

 

Step 1:  Calculation of age-specific death rates per 100,000 population in area a:

(a)     Number of deaths by age group in area a

Year

Under 1

1-4

5-9

10-14

......

55-59

60-64

1988

0

1

1

0

......

6,628

11,842

1989

2

4

1

0

......

6,087

10,959

1990

6

4

1

0

......

5,807

10,470

1991

4

0

0

2

......

5,417

9,949

(b)          Population by age-group (100,000s) in area a*

Year

Under 1

1-4

5-9

10-14

......

55-59

60-64

1988

6.47

24.54

29.83

27.84

......

24.99

24.49

1989

6.42

25.15

29.95

27.79

......

24.66

24.23

1990

6.48

25.42

30.11

28.18

......

24.43

24.10

1991

6.63

25.75

30.36

28.76

......

24.31

23.98

*   For ease of presentation numbers are truncated to the nearest thousand.

(c)     Age-specific death rates per 100,000 in each age-group/year = number of deaths divided by population (in 100,000s)

Year

Under 1

1-4

5-9

10-14

......

55-59

60-64

1988

0

0.04

0.03

0

......

265.24

483.62

1989

0.31

0.16

0.03

0

......

246.84

452.33

1990

0.93

0.16

0.03

0

......

237.72

434.41

1991

0.60

0

0

0.07

......

222.81

414.87

Step 2: Calculation of European age-standardised annual rates: Multiply the death rate for area a of age group/year by the European Standard Population  of age group and then sum these "expected" numbers of deaths.

Year

<1

1-4

5-9

10-14

......

55-59

60-64

Sum of ages

Under 65

Standard

Rates*

1988

0

261

235

0

......

1,591,457

2,418,097

5,812,752

65.31

1989

499

1,018

234

0

......

1,481,022

2,261,639

5,416,823

60.86

1990

1,482

1,007

232

0

......

1,426,291

2,172,052

5,205,524

58.49

1991

966

0

0

487

......

1,336,865

2,074,335

4,931,514

55.41

*   Obtained by dividing the sum of expected numbers at ages under 65 by the European Standard Population at ages under 65 (89,000).

Step 3: For Calculation of average rate for 3 years, add the annual rates for 3 years and divide by 3.  

Year   Standardised rate  
1989   60.86  
1990   58.49  
1991   55.41  
1989-91   58.25  

 

The European Standard Population

The European Standard Population is used to compute the directly age-standardised rates.  The same population is used for males, females and all persons.  

Age group

European Standard Population

0

1,600

1-4

6,400

5-9

7,000

10-14

7,000

15-19

7,000

20-24

7,000

25-29

7,000

30-34

7,000

35-39

7,000

40-44

7,000

45-49

7,000

50-54

7,000

55-59

6,000

60-64

5,000

65-69

4,000

70-74

3,000

75-79

2,000

80-84

1,000

85+

1,000

Total

100,000

Source: 1991 World Health Annual of Statistics - based on J Waterhouse et al (eds).
Cancer Incidence in Five Continents, Lyon, IARC, 1976 (Vol. 3,  page 456).





robert.benington@bristol.gov.uk   Injury Prevention Manager / Avonsafe Co-ordinator
01179222630  Public Health, 2nd Floor, Amelia Court, Pipe Lane, Bristol, BS1 5AA