Temporal Mismatch of Control Data
The normative population data was collected in 2013, whereas the POTS cohort data was collected between 2021 and 2022. This 8-9 year gap means there could be unknown external confounders or societal changes that impacted health-related quality of life over time, making a direct comparison less robust.
More severely affected or symptomatic individuals with POTS may have been unintentionally excluded as they might not have been able to complete the online surveys for the registry, potentially leading to an underestimation of the true burden of the disease.
Lack of Comorbidity Data for Normative Population
Comorbidity data was not collected for the normative population, making it difficult to fully disentangle the specific impact of POTS from the influence of other health conditions, which were identified as significant predictors in the POTS group.
Impact of SARS-CoV-2 Pandemic Unclear
The study period for the POTS cohort (2021-2022) occurred during the SARS-CoV-2 pandemic, and the authors acknowledge that its impact on HrQoL scores is unclear. The pandemic could have uniquely affected individuals with chronic conditions compared to general population trends.
High Female Representation
While reflecting the known epidemiology of POTS (90.6% females in the cohort), this high female representation may confound the generalizability of certain findings, such as female sex being a predictor of lower utility scores, to male POTS patients.
Single Cohort and Timepoint
The data is from a single cohort in Australia at one time point. Longitudinal data from multiple centers would provide stronger evidence on the course of HrQoL in POTS and the impact of ongoing treatment.