condition mean min max ZT0-3 1.6541575000000002 0.83999 2.468325 ZT4-7 3.36767 3.36767 3.36767 ZT8-11 2.17604 2.17604 2.17604 ZT12-15 0 0 0 ZT16-19 2.311675 2.311675 2.311675 ZT20-23 4.97575 4.97575 4.97575