condition mean min max ZT0-3 10.544167 10.544167 10.544167 ZT4-7 10.723583 10.723583 10.723583 ZT8-11 10.516359000000001 10.516359000000001 10.516359000000001 ZT12-15 15.335315999999999 15.335315999999999 15.335315999999999 ZT16-19 11.433977500000001 11.433977500000001 11.433977500000001 ZT20-23 13.422062 13.422062 13.422062