condition mean min max ZT0-3 1.3155833333333333 0.0 3.94675 ZT4-7 3.59371 3.59371 3.59371 ZT8-11 0.0 0.0 0.0 ZT12-15 5.615475 3.68215 7.5488 ZT16-19 3.523685 3.523685 3.523685 ZT20-23 0.0 0.0 0.0