condition mean min max ZT0-3 31.84255 31.84255 31.84255 ZT4-7 23.70765 23.70765 23.70765 ZT8-11 26.962400000000002 26.962400000000002 26.962400000000002 ZT12-15 26.15515 26.15515 26.15515 ZT16-19 28.794449999999998 28.794449999999998 28.794449999999998 ZT20-23 27.1163 27.1163 27.1163