condition mean min max ZT0-3 1462.9499999999998 1462.9499999999998 1462.9499999999998 ZT4-7 723.2 723.2 723.2 ZT8-11 892.0999999999999 892.0999999999999 892.0999999999999 ZT12-15 1675.75 1675.75 1675.75 ZT16-19 2555.2 2555.2 2555.2 ZT20-23 2261.95 2261.95 2261.95