Silvia Moler Zapata


Research Degree Student

15-17 Tavistock Place
United Kingdom

I am a PhD student at the Health Services Research and Policy Department at LSHTM. My research project seeks to harness recent developments in the fields of causal inference and machine learning and the advent of large observational datasets to estimate treatment effectiveness and cost-effectiveness of health technologies. 

I hold an MSc in Health Economics from the University of York. I am interested in quantitative methods for economic evaluations of health technologies.

I am funded by a NIHR ARC North Thames PhD studentship.


Faculty of Public Health and Policy
Department of Health Services Research and Policy


Centre for Statistical Methodology


Research Area
Clinical databases
Economic evaluation
Health services research
Health technology assessment
Statistical methods
Electronic health records
Health economics
United Kingdom

Selected Publications

Clinical effectiveness and cost-effectiveness of emergency surgery for adult emergency hospital admissions with common acute gastrointestinal conditions: the ESORT study
Grieve R; Hutchings A; Moler Zapata S; O'Neill S; Lugo-Palacios DG; Silverwood R; Cromwell D; Kircheis T; Silver E; Snowdon C
Health and Social Care Delivery Research
Emulating Target Trials with Real World Data to inform Health Technology Assessment: findings and lessons from an application to emergency surgery.
Moler-Zapata S; Hutchings A; O'Neill S; Silverwood RJ; Grieve R
Value in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research
Impact of the first wave of COVID-19 on outcomes following emergency admissions for common acute surgical conditions: analysis of a national database in England.
Hutchings A; Moonesinghe R; Moler Zapata S; Cromwell D; Bellingan G; Vohra R; Moug S; Smart N; Hinchliffe R; Grieve R
British Journal of Surgery
Effectiveness of emergency surgery for five common acute conditions: an instrumental variable analysis of a national routine database.
Hutchings A; O'Neill S; Lugo-Palacios D; Moler Zapata S; Silverwood R; Cromwell D; Keele L; Bellingan G; Moonesinghe SR; Smart N
Local Instrumental Variable Methods to Address Confounding and Heterogeneity when Using Electronic Health Records: An Application to Emergency Surgery.
Moler-Zapata S; Grieve R; Lugo-Palacios D; Hutchings A; Silverwood R; Keele L; Kircheis T; Cromwell D; Smart N; Hinchliffe R
Medical decision making
Estimating the Health Effects of Expansions in Health Expenditure in Indonesia: A Dynamic Panel Data Approach.
Moler-Zapata S; Kreif N; Ochalek J; Mirelman AJ; Nadjib M; Suhrcke M
Applied health economics and health policy
Variation in the rates of emergency surgery amongst emergency admissions to hospital for common acute conditions.
Hutchings A; Moler Zapata S; O'Neill S; Smart N; Cromwell D; Hinchliffe R; Grieve R
BJS open
Antibiotics as first-line alternative to appendicectomy in adult appendicitis: 90-day follow-up from a prospective, multicentre cohort study.
Javanmard-Emamghissi H; Hollyman M; Boyd-Carson H; Doleman B; Adiamah A; Lund JN; Moler-Zapata S; Grieve R; Moug SJ; Tierney GM
The British journal of surgery
See more Publications