condition mean min max ZT0-3 15.409457499999998 12.688165 18.13075 ZT4-7 11.399149999999999 11.399149999999999 11.399149999999999 ZT8-11 11.92775 11.92775 11.92775 ZT12-15 0 0 0 ZT16-19 11.52545 11.52545 11.52545 ZT20-23 13.64855 13.64855 13.64855