Development of multistate models for multimorbidity research and efficient estimation of clinically important effect measures

Qualification: PhD

Department: Health Sciences

Application deadline: 31st May 2021

Start date: September 2021

Overview

Supervisors:

Project description:

Multistate models are an important statistical tool to understand disease trajectories and can provide clinically important measures of effect and effect differences(1). Multistate models can be used to describe patterns of multimorbidity using large-scale electronic health records and, through quantification of utilities associated with disease states (e.g. quality of life measures), the individual burden of multimorbidity can be estimated. Nevertheless, there are numerous computational and analytical challenges in this framework, with multiple comorbidities and disease pathways making multistate modelling demanding without model simplification. 

This studentship will develop methods for multistate modelling in multimorbidity research, which will lead to:

  1. innovation in trajectory modelling and clustering of multimorbidity pathways. 
  2. methodological advances that underpin new data science developments in large-scale longitudinal linked electronic health records, as being curated in the Health Data Research Hubs.

The project will consider two important aspects in the developments of multistate models in multimorbidity research. Firstly, the development of models for complex disease trajectories, including approaches to relax the Markov assumption, including multiple time-scales in derivation of rates and incorporation of recurrent events. Secondly, the project will investigate efficient post-estimation simulation-based techniques to estimate clinically useful measures of effects and effect differences, such as disability- or quality-adjusted life-years and their contrasts. These measures are commonly calculated in health technology assessments using Discrete Event Simulation (DES) of multistate models (2). Variance reduction techniques such as cloning and antithetic sampling will be investigated to allow efficient estimation of incremental effects between two or more groups of interest.

These techniques will be applied to the investigation of cardiovascular and non-cardiovascular outcomes following a cancer diagnosis, utilising national data from the Virtual Cardio-Oncology Research Initiative (VICORI) (3). The student will develop user-friendly open-source software to encourage reproducible research and enable the methods to be utilized across health data research.

References:

1. Crowther MJ, Lambert PC. Parametric multistate survival models: Flexible modelling allowing transition-specific distributions with application to estimating clinically useful measures of effect differences. Stat Med. 2017 Dec 20;36(29):4719–42. 
2. Davis S, Stevenson M, Tappenden P, Wailoo A. NICE DSU Technical Support Document 15: Cost-effectiveness modelling using patient-level simulation. 2014 Apr;62. 
3. Sweeting MJ, Oliver-Williams C, Teece L, Welch CA, De Belder MA, Coles B, et al. Data Resource Profile: The Virtual Cardio-Oncology Research Initiative (VICORI) linking national English cancer registration and cardiovascular audits. International Journal of Epidemiology. Accepted for publication. 

 

Funding

Funding

This 3-year PhD Studentship provides:

  • UK/EU tuition fee waiver
  • Annual stipend rates as follows: 
    • 2021/22: £19,612
    • 2022/23: £19,906
    • 2023/24: £20,205

Entry requirements

Entry requirements

Applicants are required to hold/or expect to obtain a UK Bachelor Degree 2:1 or better or Masters degree in a subject that relates to the goals of the research group (e.g. Biostatistics, Health Data Science), or overseas equivalent qualification. 

University of Leicester English language requirements apply where applicable

Informal enquiries

Informal enquiries

Project enquiries:

Application enquiries:

How to apply

How to apply

To submit your application, please use the 'Apply' button below and select September 2021 from the dropdown menu.

With your application, please include the following:

  • CV
  • Personal statement explaining your interest in the project, your experience and why we should consider you
  • Degree Certificates and Transcripts of study already completed and if possible transcript to date of study currently being undertaken
  • Evidence of English language proficiency if applicable
  • In the reference section please enter the contact details of your two academic referees in the boxes provided or upload letters of reference if already available.
  • In the funding section please specify that you wish to be considered for a Health Data Research UK studentship
  • In the research proposal section please provide the name of the project supervisors and project title (a research proposal is not required)
     

     

 

Eligibility

Eligibility

UK/EU applicants only