He states that the pain in his shoulder is maximal when compared to other injuries.

[Zoni]

He states that the pain in his shoulder is maximal when compared to other injuries.

What type of word is ‘when’ in the sentence? Can you give me another example?
Also, can you explain the grammar of “compared to” in this sentence?

 

[tedmc]

when compared to - if judged/measured with something similar

 

[jutfrank]

I'm not sure of what kind of answer you require. Are you asking about meaning? Do you understand what the sentence means?