condition mean min max ZT0-3 2.0198799999999997 2.00486 2.0349 ZT4-7 2.30571 2.30571 2.30571 ZT8-11 1.7006649999999999 1.7006649999999999 1.7006649999999999 ZT12-15 0 0 0 ZT16-19 3.17054 3.17054 3.17054 ZT20-23 2.346955 2.346955 2.346955