condition mean min max ZT0-3 7.302465 7.302465 7.302465 ZT4-7 8.7551 8.7551 8.7551 ZT8-11 1.6691099999999999 1.6691099999999999 1.6691099999999999 ZT12-15 2.6370199999999997 2.6370199999999997 2.6370199999999997 ZT16-19 3.5502149999999997 3.5502149999999997 3.5502149999999997 ZT20-23 6.877174999999999 6.877174999999999 6.877174999999999