condition mean min max ZT0-3 31.465044 31.465044 31.465044 ZT4-7 59.490189 59.490189 59.490189 ZT8-11 55.6155375 55.6155375 55.6155375 ZT12-15 66.881588 66.881588 66.881588 ZT16-19 53.619465500000004 53.619465500000004 53.619465500000004 ZT20-23 44.4979285 44.4979285 44.4979285