condition mean min max ZT0-3 0.4620385 0.427128 0.496949 ZT4-7 0.5904309999999999 0.5904309999999999 0.5904309999999999 ZT8-11 0.619707 0.619707 0.619707 ZT12-15 0 0 0 ZT16-19 0.6491389999999999 0.6491389999999999 0.6491389999999999 ZT20-23 0.805985 0.805985 0.805985