Okay, the user wants me to translate "co-variate" into Arabic. Let me check if the word is already in Arabic. No, it's in English. The translation of "co-variate" in Arabic is "متغير مشترك" or "متغير مصاحب". I need to make sure which term is more commonly used. "متغير مشترك" seems more accurate here. I'll provide that as the translation.