A little question

So i was searching my info's on op.gg for the first time since a friend of mine told me to check out how well i do with my Lux. I have to say, you can find alot of things about your account there but something i didn't understand too well it's the kda thingy.

I mean i know KDA meand Kills Deats and Assists but why do i have that 5.93:1 or something like that there? Is it good or bad and i noticed that on the rest on my champs i play i have about 4 and smth but on Lux is the highest.

Can a good soul enlighten me pls?