condition mean min max ZT0-3 0.5118518333333333 0.0 1.0093005 ZT4-7 1.8164715 1.8164715 1.8164715 ZT8-11 5.22484 5.22484 5.22484 ZT12-15 2.4690925000000004 1.29975 3.6384350000000003 ZT16-19 1.657695 1.657695 1.657695 ZT20-23 0.71659 0.71659 0.71659