condition mean min max ZT0-3 1.2629675 1.2216 1.304335 ZT4-7 1.847335 1.847335 1.847335 ZT8-11 2.053725 2.053725 2.053725 ZT12-15 0 0 0 ZT16-19 1.707805 1.707805 1.707805 ZT20-23 2.20833 2.20833 2.20833