With regard, i want to know about causes of gluteal abscess and what percent of them is related to injection nurse laches?

No association..: There is no direct association between lash of a needle vs another way of inserting it. If the abscess came after needle insertion the cause of the infection is not the fashion the needle was given but rather the opening a needle causes which is open door for infection. This can happen with any type of injection or wound that opens the skin no matter how small or how it happens.