condition mean min max ZT0-3 9.57743 9.417145 9.737715000000001 ZT4-7 7.036099999999999 7.036099999999999 7.036099999999999 ZT8-11 5.744009999999999 5.744009999999999 5.744009999999999 ZT12-15 0 0 0 ZT16-19 7.839035 7.839035 7.839035 ZT20-23 8.374685 8.374685 8.374685