Introduction: Several studies indicate that the acute phase of COVID-19 may be followed by persistent symptoms. However, the impact of COVID-19 on long-term health outcomes remains to be elucidated.

Aims: The Precision Medicine for more Oxygen (P4O2) COVID-19 study aims to identify long COVID patients that are that are at risk for developing chronic lung disease and to identify treatable traits and innovative personalized therapeutic strategies for prevention and treatment. This study describes the baseline characteristics of the P4O2 COVID-19 cohort.

Methods: Long COVID patients were recruited from 5 different hospitals in The Netherlands at 3-6 months post-COVID. Data from medical records and biological samples were collected, pulmonary function tests and chest computed tomography scans were performed and questionnaires were administered during 2 study visits.

Results: 95 long COVID patients were enrolled between May 2021 and September 2022. Study participants were aged 54.2 years on average and of female sex in 49.5% of all cases. Most patients were hospitalized(89.5%) for COVID-19 with a mean hospital stay duration of 8 days. The current study showed persistence of clinical symptoms and signs of pulmonary function test/radiological abnormalities in long COVID patients(81%). The most frequently reported symptom categories were respiratory(80%) and fatigue(69.5%). Both female sex and infection with the Delta, compared with the Beta, SARS-CoV-2 variant were significantly associated with more persisting symptoms.

Conclusions: The first descriptive results of the P4O2 COVID-19 cohort show that long COVID patients show signs of radiological/functional abnormalities and can suffer from a wide range of persisting symptoms.