condition mean min max ZT0-3 3.4364566666666665 1.70424 5.234355 ZT4-7 1.657025 1.657025 1.657025 ZT8-11 2.424645 2.424645 2.424645 ZT12-15 0.41683 0.0 0.83366 ZT16-19 0.0001366865 0.0001366865 0.0001366865 ZT20-23 4.0438849999999995 4.0438849999999995 4.0438849999999995