WTF are those demographics trying to tell me? I can't for the life of me figure out what the No Kids/Has Kids metric means. No Kids 0-17 Has Kids 0-17 No Kids

WTF are those demographics trying to tell me? I can't for the life of me figure out what the No Kids/Has Kids metric means. No Kids 0-17 Has Kids 0-17 No Kids 0-2 Has Kids 0-2 What?