Mixed-method observational study: the impact of pandemic related changes in healthcare on quality of life and experiences with healthcare in Dutch patients undergoing surgery or another intervention during the covid pandemic (2020-2021).

Phase 1: qualitative study to gain insight in relevant themes in Patient Reported Experiences Measures (PREMs) by conducting focus groups Phase 2: creating and validating a questionnaire based on themes identified in phase 1 Phase 3: questionnaire study among Dutch patients who underwent an intervention in 2020-2021 using the validated questionnaire of phase 2. The answers will be linked to data from national patients registries in surgery, cardiology, orthopedics and neurology.

Inclusion Criteria:

• undergoing surgery or intervention in the Netherlands in 2020 or 2021

Exclusion Criteria:

• participation language restricted to Dutch

(former) surgical, orthopedic, cardiological patients

all collected IPD; the available dataset is anonymised and cannot be linked to other datasets.

from 01-01-2027 until 30-04-2039

The anonymised dataset is available upon request to the principal investigator Prof. Schelto Kruijff. Requests can be send by email and should include a description of the study objective, primary and secondary outcomes, other data sources that will be used (if applicable), and a brief analysis plan. After discussion within the COVID Surg III research collective, the PI will decide whether or not the dataset will be shared with the requesting researcher. After a positive decision a data sharing agreement will be drafted and signed before the data is shared via a secured digital pathway, for example Zivver.