condition mean min max ZT0-3 0.36122175 0.3595915 0.36285199999999995 ZT4-7 0.4887765 0.4887765 0.4887765 ZT8-11 0.123072 0.123072 0.123072 ZT12-15 0 0 0 ZT16-19 0.27784699999999996 0.27784699999999996 0.27784699999999996 ZT20-23 0.478973 0.478973 0.478973