condition mean min max ZT0-3 1.9534325 1.9534099999999999 1.953455 ZT4-7 3.44208 3.44208 3.44208 ZT8-11 4.226105 4.226105 4.226105 ZT12-15 0 0 0 ZT16-19 3.63653 3.63653 3.63653 ZT20-23 2.97553 2.97553 2.97553