The annual Recorded Dementia Diagnoses publication for 2019-20 covers key facts taken from the monthly releases covering April 2019 to March 2020, including an ARIMA forecast of estimated diagnosis rate. The aim set out in the 2015 Prime Minister’s Challenge on Dementia 2020 is for at least two thirds (66.7%) of people with dementia to have received a formal diagnosis. In the past year, the national estimated dementia diagnosis rate for those aged 65 and over has consistently exceeded this ambition, however at no point has it become statistically significantly greater.
The confidence intervals used alongside the rate are derived from measures of uncertainty given with the CFAS II reference rates and the uncertainty around the numerator. The indicator is calculated to produce an overall distribution of indicator values closely approximating the true distribution. Since April 2020, the rate and confidence intervals have been decreasing demonstrating an impact from the initial peak of the COVID-19 pandemic.
Please note, in previous years and before the COVID-19 pandemic, the rate of diagnosis for dementia varies across different areas of England. This report has focused on the data and impact of COVID-19 at a national level for England and has not explored the regional variance.
Month |
Diagnosis rate (%)
|
Lower 95% confidence limit
|
Upper 95% confidence limit
|
Jan-20
|
67.6
|
60.9
|
73.3
|
Feb-20
|
67.4
|
60.7
|
73.0
|
Mar-20
|
67.4
|
60.7
|
73.0
|
Apr-20
|
65.4
|
58.9
|
70.9
|
May-20
|
64.0
|
57.7
|
69.3
|
Jun-20
|
63.5
|
57.2
|
68.8
|
Jul-20
|
63.2
|
57.0
|
68.5
|
Aug-20
|
63.1
|
56.8
|
68.3
|
When the diagnosis rate recorded in April 2020 is plotted against the ARIMA forecast, which used data up to 31st March 2020, the model shows the published diagnosis rate to be an outlier, falling far outside the prediction confidence intervals. This suggests the decrease observed was not a likely outcome given the trends seen in the previous 40 months of data and therefore a associated with the coronavirus (COVID-19) pandemic.
Since 31st March 2020, the diagnosis rate has continued to decrease from 67.4% to 63.1% on the 30th August 2020. In summary, the indicator has been impacted by the following points, as outlined in the report
Number of patients diagnosed with dementia, the numerator for the rate
Deaths in dementia patients
Reports by Public Health England and Office of National Statistics show there were excess deaths for patients which mentioned dementia and Alzheimer’s along with COVID-19. For the week of 24th April, 2,442 excess deaths were recorded mentioning COVID-19 from a total of 3,804 excess deaths mentioning dementia and Alzheimer’s disease.
Decrease in referrals and other care of dementia patients
With hesitance to attend health care services, advice for older people to remain at home and a reduction in memory clinic services, there has been a decrease in referrals and other measures included in the Recorded Dementia Diagnoses publication. Analysis of the measure Number of patients with a record of receiving an assessment for dementia by the GP practice who have a record of a referral to a memory clinic estimates 7,590 patients were not referred to memory clinics since February 2020.
Change in healthcare activity
With the change in guidance for social distancing, and under revised NHS England operating guidance, activity in general practice has moved to telephone or video service with a decrease in face to face appointments.
Estimated number of dementia patients, the denominator for the rate
Increase in deaths across the population
Throughout the COVID-19 pandemic, there has been an increased number of deaths which are reported by ONS, with those aged 85 to 89 years accounting for the highest number of deaths involving COVID-19.
CFASII methodology
The methodology is designed to reflect a population similar to the population within the study. The CFASII estimated population may not reflect the current population due to increase in deaths across the population and the older age groups
Decrease in patients registered at a general practice, aged 65 and over
The decrease in registered patients this period is likely due to an increase in deaths, a decrease in immigration, and potentially increased list cleansing activities brought about by additional activities to contact vulnerable patients. Throughout April 2020, there was less activity surrounding registrations in primary care including those aged 65 and over which decreased by approximately 23,900 patients in May 2020. This is the population used to estimate the number of patients suffering with dementia in England.