condition mean min max ZT0-3 1.4521145 1.328855 1.5753739999999998 ZT4-7 1.0095785 1.0095785 1.0095785 ZT8-11 1.464315 1.464315 1.464315 ZT12-15 0 0 0 ZT16-19 1.80559 1.80559 1.80559 ZT20-23 1.3323945 1.3323945 1.3323945