Calculating Intra class correlation in random intercept ordered probit model (mixor package in R)

I am using Mixor package (https://www.rdocumentation.org/packages/mixor/versions/1.0.4/topics/mixor) to analyze influencing factors on individuals' injury severity. I considered individuals involved in a crash as a cluster. The issue is I couldn't figure out how to calculate intra class correlation to make sure my assumption was correct.

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