4363.0 - National Health Survey: Users' Guide, 2014-15
ARCHIVED ISSUE Released at 11:30 AM (CANBERRA TIME) 31/07/2017
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COMORBIDITY
For each comorbidity data item, the following section outlines the:
For information on the ICD10 classifications or Condition status item, refer to the Health Conditions section of this Users' Guide. Population The population for the comorbidity data items is all persons in the 2014-15 NHS and they are located on the selected person level. Methodology Information about comorbidity was first published in the National Health Survey: First Results, 2014-15 based on a sample of 19,259 people. COMORBIDITY (SELF REPORT) Definition This data item is produced for combinations of the following conditions:
For the purposes of deriving this item the following definitions were used: Diabetes To be classified as having diabetes, the respondent needed to have been diagnosed with diabetes mellitus (type1, type2 , type not known) regardless of their condition status. For further information refer to the Diabetes Mellitus sub-section of this Users' Guide. Kidney Disease To be classified as having kidney disease the respondent needed to have been diagnosed with kidney disease and have reported that the condition is current. This condition is assumed to be long-term and is identified as having condition status of 1, For further information refer to the Kidney disease sub-section of this Users' Guide. Cardiovascular DIsease To be classified as having cardiovascular disease (CVD), the respondent needed to have been diagnosed with one of the following conditions: The following conditions were required to have been diagnosed and also current and long-term (condition status 1):
The following conditions only required diagnosis (condition status 1,2 or 3):
For further information refer to the Heart and circulatory conditions sub-section of this Users' Guide. Methodology Using the defined conditions, the following output categories were produced: 1. Diabetes only 2. Kidney disease only 3. CVD only 4. Diabetes and kidney disease only 5. Diabetes and CVD only 6. Kidney disease and CVD only 7. Diabetes and kidney disease and CVD 8. Does not have Diabetes or kidney disease or CVD In this item each respondent is allocated to only one category. In order to create some flexibility with the use of this item, categories 1 to 3 were produced, which contain persons with only one condition and also category 8 which contain persons with none of the conditions. To produce frequencies based on different combinations of these conditions, users can collapse categories as required. For example, to determine those people with either Kidney Disease or CVD, combine categories 2,3,4,5,6,7. To determine those people who don't have CVD, combined categories 1,2,4 and 8. COMORBIDITY (SELF REPORT) - MUSCULOSKELETAL Definition This data item is produced from 2014-15 NHS data for combinations of the following conditions:
For the purposes of deriving this item the following definitions were used: Arthritis To be classified as having arthritis, the respondent needed to have current and long-term Rheumatoid, Osteoarthritis or Other/Type unknown Arthritis. These conditions are identified as having condition status of 1 or 4. For further information refer to the Arthritis sub-section of this Users' Guide. Other musculoskeletal conditions To be classified as having other musculoskeletal conditions, the respondent needed to have a current and long-term status (condition status 1 or 4) for one or more of the following conditions:
For further information about other musculoskeletal conditions refer to the Arthritis, Osteoporosis and Long-term Conditions (Other) sub-sections of this Users' Guide. Methodology Using the defined conditions, the following output categories were produced: 1. Has arthritis only 2. Has other musculoskeletal conditions only 3. Has arthritis and at least one other musculoskeletal condition 4. Does not have arthritis or other musculoskeletal conditions In this item each respondent is allocated to only one category. In order to create some flexibility with the use of this item, categories 1 and 2 were produced, which contain persons with only one condition and also category 4 which contain persons who do not have a musculoskeletal condition. COMORBIDITY (SELF REPORT) - RESPIRATORY Definition This data item is produced from 2014-15 NHS data for combinations of the following conditions:
For the purposes of deriving this item the following definitions were used: Asthma To be classified as having asthma, the respondent needed to have been diagnosed and the asthma to be current (has had symptoms in the last 12 months). This condition is identified as having condition status of 1 and 4. For further information refer to the Asthma sub-section of this Users' Guide. Other chronic lower respiratory disease To be classified as having other chronic lower respiratory disease, the respondent needed to have been diagnosed with bronchitis or emphysema or they had not been diagnosed but considered their condition to be current and long-term. These conditions are identified as having condition status of 1 and 4. For further information about other chronic lower respiratory disease refer to the Long-term Conditions (Other) sub-section of this Users' Guide. Methodology Using the defined conditions, the following output categories were produced: 1. Has asthma only 2. Has other chronic lower respiratory disease only 3. Has asthma and at least one other chronic lower respiratory disease 4. Does not have asthma or other chronic lower respiratory diseases In this item each respondent is allocated to only one category. In order to create some flexibility with the use of this item, categories 1 and 2 were produced, which contain persons with only one condition and also category 4 which contain persons who do not have a respiratory condition. Comparability with 2011-12 In 2011-12, the 'Comorbidity (Self Report) item was collected in both the NHS and the NNPAS surveys (i.e. the AHS Core), while the 'Comorbidity (Self Report) - Musculoskeletal' and 'Comorbidity (Self Report) - Respiratory' items were only collected in the 2011-12 NHS. In 2011-12, comorbidity items were calculated for both self-reported conditions and conditions based on biomedical data. As biomedical data was not collected in the 2014-15 NHS, comorbidity items based on biomedical data are not available. When making comparisons between 2014-15 and 2011-12 data it is recommended that:
A number of changes have been made in the the 2014-15 NHS which may affect comparability of these items with 2011-12 data. These include:
During processing of 2014-15 NHS data, an issue with coding of 'Gout' and 'Rheumatism' in the 2007-08 and 2011-12 NHS was identified in which a large number of people who reported having these conditions were erroneously allocated a status of 'current and long-term', resulting in over-estimation of prevalence in 2007-08 and 2011-12. In 2007-08 'Gout' was over-reported by approximately 800,000 people and 'Rheumatism' by approximately 290,000 persons, while in 2011-12 'Gout' was over-reported by approximately 280,000 people and 'Rheumatism' by approximately 145,000 people. Data for 2007-08 and 2011-12 for these two conditions are not comparable to other years. Data for 2014-15 have been correctly coded. ABS are investigating options to address this issue for previous years.
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