condition mean min max ZT0-3 0.4955695 0.4955695 0.4955695 ZT4-7 0.21061249999999998 0.21061249999999998 0.21061249999999998 ZT8-11 0.133633 0.133633 0.133633 ZT12-15 0.6183995 0.6183995 0.6183995 ZT16-19 1.658085 1.658085 1.658085 ZT20-23 1.099747 1.099747 1.099747