We did an multi-centre, observational cohort study in patients who had surgery in 2023. We included participants who underwent surgery after the COVID-19 to lift the lockdown in China. Patients meeting the same criteria were eligible who had been treated during the same calendar period of 2019 through 2021. The primary outcomes were the post-operative in-hospital complications. We hypothesized that the post-operative in-hospital complications during the COVID-19 to lift the lockdown period in China were different to complications for the same kind of patients during the same calendar period of the previous years.
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Post-operative complications
Timeframe: postoperative in-hospital or 7-day complication