condition mean min max ZT0-3 15.40315 15.40315 15.40315 ZT4-7 13.476849999999999 13.476849999999999 13.476849999999999 ZT8-11 11.41375 11.41375 11.41375 ZT12-15 13.26875 13.26875 13.26875 ZT16-19 18.78425 18.78425 18.78425 ZT20-23 15.75325 15.75325 15.75325