condition mean min max ZT0-3 378.782889 378.782889 378.782889 ZT4-7 373.23747649999996 373.23747649999996 373.23747649999996 ZT8-11 397.5012875 397.5012875 397.5012875 ZT12-15 360.557973 360.557973 360.557973 ZT16-19 322.5488625 322.5488625 322.5488625 ZT20-23 335.5457275 335.5457275 335.5457275