condition mean min max ZT0-3 2.7134 2.7134 2.7134 ZT4-7 1.71049 1.71049 1.71049 ZT8-11 1.5821450000000001 1.5821450000000001 1.5821450000000001 ZT12-15 1.849335 1.849335 1.849335 ZT16-19 2.896585 2.896585 2.896585 ZT20-23 2.83654 2.83654 2.83654