condition mean min max ZT0-3 2.9591975 2.56404 3.354355 ZT4-7 2.60946 2.60946 2.60946 ZT8-11 2.55812 2.55812 2.55812 ZT12-15 0 0 0 ZT16-19 2.521845 2.521845 2.521845 ZT20-23 0.84075 0.84075 0.84075