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. 2019 Nov 14;14(11):e0224226. doi: 10.1371/journal.pone.0224226

Table 1. Overview of model parameters.

Parameter Description Notes on Data Sources Potential Data Sources
Key Parameters
Pediatric HIV treatment coverage Percentage of eligible children (0–14 ages) in need of ART reached National-level coverage rates are generally publicly reported. Data reported by Ministries of Health, UNAIDS, United Nations Children's Fund (UNICEF), WHO
Routine viral load testing (different rates for first- and second-line treatment) Percentage of ART patients who undergo viral load testing (assumes 1 routine test per patient per year) Limited data exists regarding routine viral load testing among pediatric patients. In the absence of appropriate national-level data, values should reflect clinical study data, available testing data (adult populations), and qualitative data on testing infrastructure and routine testing practices in resource-limited settings. Clinical study data, qualitative data from peer-reviewed articles, UNAIDS data (adults only)
Viral load non-suppression rate (different rates for first- and second-line treatment) Percentage of patients receiving viral load tests who are not virologically suppressed Limited data exists regarding pediatric viral load suppression rates. In the absence of appropriate national-level data, values should reflect relevant clinical study data, available viral load suppression rate data (adult populations), and qualitative data on factors influencing suppression rates and trends. Clinical study data, qualitative data from peer-reviewed articles, UNAIDS data (adults only)
Confirmed treatment failure (different rates for first- and second-line treatment) Percentage of patients whose treatment failure is confirmed by a confirmatory viral load test (or, where available and appropriate, a resistance test) prior to switching to second-line Limited data exists regarding pediatric HIV treatment failure. In the absence of appropriate national-level data, values should reflect a survey of clinical studies and observations from practicing clinicians. Recent WHO data revealed a broad range of estimated treatment failure rates (from over 30% to 0.5%). Clinical study data, qualitative data from peer-reviewed articles, WHO data
Patient loss (different rates for first- and second-line treatment) Percentage of patients lost following viral load testing and not linked to additional care (drivers include lack of access, loss to follow up, and mortality) At various stages over the course of treatment, patients will be lost due to lack of access (to treatment, services, and/or care), loss to follow up, and mortality. In the absence of appropriate national-level data, values should reflect clinical study data. A review of recent studies suggests that adherence is a larger problem for pediatric patients than for adult patients and that there are greater barriers to access for pediatric HIV services and care as compared to adult services. Clinical study data, qualitative data from peer-reviewed articles
Foundational Parameters
Mortality Annual number of pediatric HIV patient deaths expressed as a percentage of the total pediatric HIV patient pool National-level AIDS-related mortality rates for the pediatric HIV+ population are generally publicly reported. UNAIDS data (children)
New cases Decrease in number of new cases of HIV infections among children (0–14 years) expressed as a percentage change National-level data on new cases of pediatric HIV are generally publicly reported. UNAIDS data (children)
Rate of aging out Percentage of children who age out of the 0–14 age cohort (on an annual basis) In the absence of national-level data for the pediatric HIV+ population, demographic data for the general population within the 0–14 age cohort can be used as a proxy. UN World Population Prospects