The body mass index (BMI) was not independently associated with favourable neurologic and survival outcomes of patients surviving from out-of-hospital cardiac arrest (OHCA).

Nine hospitals were enrolled; finally, 605 patients were included in our analysis and categorised per the WHO BMI classification.

Favourable neurologic outcomes were less frequent in the underweight BMI group than in the other groups (p = 0.002); survival to discharge was not significantly different among the BMI groups (p = 0.110).

This multicentre, prospective, nationwide OHCA registry-based study was conducted using data from the Korean Cardiac Arrest Resuscitation Consortium (KoCARC).

We enrolled hospitals willing to collect patient height and weight and included patients who survived to the hospital between October 2015 and June 2018.

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