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Predictive Models for Health and Social Care: A feasability study
1.
Predictive Models for
Health and Social Care: A Feasibility Study Authors: Bardsley M, Billings J, Dixon J, Georghiou T, Lewis GH, Steventon A (2011) ‘Predicting who will use intensive social care: case finding tools based on linked health and social care data’, Age and Ageing 40(2): 265-270 February 2011 © Nuffield Trust
2.
Background Key points Evidence that
admission to a nursing home can be delayed or avoided by means of preventative ‘upstream’ interventions Increasingly, public services will have to become more proactive in identifying and managing risk in older people, in order to mitigate them as much as possible It will be important to identify and support not just those at highest risk of these costs, but also those currently at lower risk who might become higher risk in future Current methods of assessing risk largely rely on face to face assessments. In health care this approach has been shown to be less accurate at predicting predicting future events (hospitalisation) compared to statistical models. From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
3.
Predictive modelling • BMJ
in paper* in 2002 showed Kaiser Permanente in California seemed to provide higher-quality healthcare than the NHS at a lower cost. Kaiser identify high risk people in their population and manage them intensively to avoid admissions • Modelling aims to identify people at risk of high costs in future • Use pseudonymous, person-level data • In health sector a number of predictive models are available e.g. PARR++ and the combined model. *Getting more for their dollar: a comparison of the NHS with California's Kaiser Permanente BMJ 2002;324:135-143 From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
4.
Predictive Models Identify
who will be where on next year’s Kaiser Pyramid From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
5.
Patterns in routine
data to identify high-risk people next year From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
6.
Patterns in routine
data to identify high-risk people From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
7.
Patterns in routine
data to identify high-risk people From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
8.
Distribution of Future
Utilisation is Exponential From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
9.
Can we predict
costly social care events in the same way? • Do the data exist in local systems? • Can we extract individual, person-level data? • Can we link a wide range of health and social care data at the person level? • Are the data accurate and complete enough to use? • Can we build a valid statistical model? From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
10.
Feasibility Project • Funded
by Department of Health Care Services Efficiency Delivery (CSED) programme over 18 months • Worked with 5 sites to extract data sets • Extracted person-level health & social care data sets • Linked data from GP records (2 sites); GP register (all sites); Hospital (all sites); Social Care (all sites) • Undertook exploratory analyses and ran a range of models • Tested the impacts of different data sets on the models From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
11.
Using health and
social care data to predict health and social care use From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
12.
Using routine data •
Less labour intensive so they can stratify the population systematically and repeatedly • Avoid “non-response bias” • Can identify people with lower, emerging, risk • Important issues of confidentiality and consent to consider • Linking data sources at individual level across health and social care is problematic where there is no NHS number in social care • The tools are never 100% accurate • Data may be missing from routine databases on certain groups From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
13.
Predictive factors –
examples From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
14.
Information flows From: Predictive
Models for Health and Social Care: A Feasibility Study © Nuffield Trust
15.
Data collected • From
four ‘sites’ (~ PCT areas) • Total seven organisations: 3 PCTs, 1 Care trust, 3 LAs • Total 1.4M pop (range 100,000-700,000) From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
16.
Data linkage -
approach First instance: NHS number (encrypted) from LA In absence of NHS number: • Central ‘batch tracing’? • Shared PCT/LA databases? Ultimately: •construction of ‘alternative IDs’ 97% of individuals in one site (population ~400,000) were found to have unique ‘alternative ID’. From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
17.
Data linkage Groups of
people in social care data – how many are we able to match to GP register list (of ages 75+)? Varies, but better for those with > service use From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
18.
Data linkage Social &
secondary care interface From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
19.
Predictive value, sensitivity
and specificity of the model incorporating a £5,000 threshold From: Predictive Models for Health and Social Care: A Feasibility Study Predicting social care costs: feasibility study © Nuffield Trust
20.
Information on Social
Care Needs From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
21.
Simplifying and sorting
Accommodation Adaptation Adult Placement Advice Given Carer Support Counselling DA1 Day Care Direct Payments Domiciliary Employment/Training Equipment Fostering Group Activity Holiday Payment Housing Advice Given ILS Independent Living Individual Informal Projects Information & Advice Lifeline 400 Lifeline 400 + Smoke Alarm Mobility Training (DAY) Mobility Training (NIGHT) Nursing Nursing (Block Contract) Nursing Block Beds Old Codes OT Advice Given OT Rehab Sessions Other Other Carer Support Services Outreach Permanent Placements with Parents Professional Support R.O. Allowance Referral to Carers Contact Line Referral to Carers Information Service Referral to Crossroads Registration Rehabilitation Residential Residential Block Beds Respite Respite (Carer) Secure Accommodation Sheltered Social Development Special Sheltered Specialist Assessment and/or Treatment Specialist Communication Equipment Specific Approval Support Supported Living Talking Book Machine Time Allocation Vouchers Training Transport Washer From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
22.
Individual histories From: Predictive
Models for Health and Social Care: A Feasibility Study © Nuffield Trust
23.
Transitions in care
(75+ in one site) From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
24.
Individual health and
social care event timeline over a three-year period From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
25.
Predictive Modelling Attempting to
predict: • For over 75s a) Admission to care home (or receipt of high intensity home care) or £5,000 increase in social care costs in one year b) Where person had no ‘significant’ costs in prior two years From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
26.
Original models predicting
change at £5k threshold From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
27.
Diagram From: Predictive Models
for Health and Social Care: A Feasibility Study © Nuffield Trust
28.
Distillation flask From: Predictive
Models for Health and Social Care: A Feasibility Study © Nuffield Trust
29.
Trade off between
PPV (blue line) and sensitivity (red line) according to different risk cut-offs From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
30.
Which variables are
important in pooled £1k model? From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
31.
Models using lower
£1k thresholds From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
32.
Impact of adding
new datasets From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
33.
Iteration with Sites
- Application • Several sites said they would like to run the Combined Model and the social care model “side-by-side” • Theographs thought to be very useful • Differences between sites: some sites preferred small numbers of clients others wanted large numbers for mail-shots • Regarded concerns over invasion of privacy as “a non-issue if the wording is right” • Keen to use predictive models for existing or planned re-ablement services and multidisciplinary teams From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
34.
Personal observations on
social care data We could access user level social care data but... • Different systems • Issues of standardisation /coding etc and the absence of standard, structured coding schemes • Some very detailed information collected but can be difficult to use in models • We found it harder to obtain information on descriptions of needs • Local concerns about data quality • Note the history of comparative benchmarking From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
35.
From: Predictive Models
for Health and Social Care: A Feasibility Study © Nuffield Trust
36.
Headlines • We have
created linked health/social care data sets in five sites (overall populations about 2 million people aged 75+) • We modelled intensive social care: • Models had satisfactory PPV but low sensitivity at a risk score threshold of 50 (although can be traded-off against each other) • Mainly social care driven • Though accuracy worse than PARR model, accuracy was comparable with SPARRA and the combined model • Discussion with sites – they were less concerned with model performance than we were • We tried dozens of ways to improve the basic model (5K) • We modelled change in social care costs with lower thresholds: 1K models are much better but usefulness may be diminished From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
37.
And the data
have so much more to offer..... • Cost modelling • Iso-resource classification (individual budgets) • Trajectories and transitions of care • Evaluation (re-ablement) • Information for - Commissioners and managers - Professionals - Service users and carers From: Predictive Models for Health and Social Care: A Feasibility Study © Nuffield Trust
38.
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