Skip to main content

Table 4 Summary of Hotelling’s T2 statistics for chronic health conditions in the transition periods

From: Transitions between versions of the International Classification of Diseases and chronic disease prevalence estimates from administrative health data: a population-based study

Chronic Health Condition

Transition period from ICDA-8 to ICD-9-CM

Transition period from ICD-9-CM to ICD-10-CA

Max T2

Average T2

Max T2

Average T2

Mood and anxiety disorders

29.0

17.7

10.8

7.0

Menstrual disorders

22.5

16.5

9.7

7.3

Hypertension

20.9

11.9

10.9

7.6

Osteoarthritis

20.0

13.6

12.3

7.1

Anemia

28.4

15.3

11.0

8.6

Diabetes

21.7

15.9

9.8

6.9

Asthma

20.1

12.3

12.8

8.1

Acute myocardial infarction

16.0

10.2

10.4

9.5

Heart valve disorders

23.0

13.9

12.9

8.5

Acute cerebrovascular disease

19.5

14.5

12.8

8.0

Cataracts

24.1

16.4

10.5

6.9

Breast cancer

26.2

13.7

8.8

6.0

Colon cancer

17.2

12.7

9.5

7.9

Lung & respiratory cancers

17.3

12.0

13.7

10.2

Prostate cancer

29.9

18.2

10.5

5.0

Skin cancer

27.3

20.2

12.2

6.5

  1. Data sources are physician billing claims and hospital records; Boldface font indicates a test statistic value greater than the upper control limit of 19.8; The transition period was defined as \(\pm 2\) years around the transition year of 1979 for the transition from ICDA-8 to ICD-9-CM, and around the transition year of 2005 for the transition from ICD-9-CM to ICD-10-CA