condition mean min max ZT0-3 22.901850000000003 21.914 23.8897 ZT4-7 16.24325 16.24325 16.24325 ZT8-11 13.312999999999999 13.312999999999999 13.312999999999999 ZT12-15 0 0 0 ZT16-19 22.27915 22.27915 22.27915 ZT20-23 17.96165 17.96165 17.96165