Dictionary

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Symptom BurdenTermSymptom Load, Overall Symptom Impact

A measure of a disease's overall symptom impact on a patient, covering both the number and severity of symptoms experienced.

Symptom FrequencyTermSymptom Rate, Symptom Occurrence

A dimension of symptom assessment capturing how often a particular symptom occurs over a defined recall period, distinct from its severity.

Symptom SeverityTermSymptom Intensity, Symptom Grade

A dimension of symptom assessment capturing the intensity of a particular symptom when it occurs, distinct from how often it occurs.

Symptom-Free SurvivalTermSymptom-Free Interval, Time to Symptom Onset

A time-to-event measure defined as the time from treatment start until the onset or return of clinically significant symptoms.

Symptomatic OutcomeTermSymptom-Based Outcome, Symptom Endpoint

Any clinical outcome measure focused on the presence, frequency, or severity of disease-related symptoms, unlike survival, biomarker, or functional outcomes.

Symptomatic ResponseTermSymptom Response, Symptom Improvement

A measure indicating a clinically meaningful improvement in disease-related symptoms following treatment, defined using an established threshold for the relevant measure.

Symptomatic TreatmentTermSymptom-Directed Treatment, Comfort-Oriented Treatment

Treatment aimed at relieving a condition's symptoms without addressing its underlying cause, commonly used when no curative treatment is available.

Synthetic ControlConceptSynthetic Comparator, Data-Derived Control

A quasi-experimental method constructing a weighted combination of untreated units to serve as a comparison group resembling a treated unit before intervention.

Synthetic DataTermArtificial Data, Generated Data

Artificially generated data statistically mimicking real data's properties without containing actual information from any real individual, protecting patient privacy.

System AnalysisTermSystems Analysis, Health Systems Analysis

An examination of how the financing, workforce and service delivery of a health system interact to produce population health outcomes.

System Dynamics ModelConceptSD Model, System Dynamics Simulation

A modelling approach representing a complex system using stocks, flows, and feedback loops to capture how it evolves through internal dynamics.

System EffectivenessTermOverall Effectiveness, Outcome Attainment

A measure of the degree to which a health system achieves its goal of improving population health outcomes.

System QualityTermOverall Care Quality, Organisational Quality

The overall degree to which an entire health system achieves desired outcomes consistent with professional knowledge, delivered efficiently and equitably.

System ResilienceTermSystem Robustness, Shock-Absorption Capacity

A health system's capacity to prepare for, respond to, and recover from a significant shock, such as a disease outbreak, while continuing essential services.

System SustainabilityTermSystemic Viability, Long-Run Affordability

The capacity of a health system's financing, workforce, and infrastructure to be maintained long term without unsustainable debt or disruptive cuts.

System TestingTermIntegrated Testing, End-to-End Testing

A verification technique evaluating a complete model as an integrated whole, confirming all its components work together to produce sensible results.

Systematic ErrorTermDirectional Error, Consistent Error

A consistent, non-random deviation of results from the true value, arising from a specific flaw in design, measurement, or analysis.

Systematic ReviewConceptSystematic Literature Review, SLR

A structured, comprehensive, reproducible approach to identifying, evaluating, and synthesising all available evidence relevant to a clearly defined question.

Systematic Review HTATermHTA Systematic Review, HTA Evidence Review

A systematic review conducted specifically to support a health technology assessment, focused on comparative clinical effectiveness and safety versus alternatives.