condition mean min max ZT0-3 1.35585 1.35585 1.35585 ZT4-7 0.8112174999999999 0.8112174999999999 0.8112174999999999 ZT8-11 1.5771000000000002 1.5771000000000002 1.5771000000000002 ZT12-15 1.18769 1.18769 1.18769 ZT16-19 1.642675 1.642675 1.642675 ZT20-23 1.35426 1.35426 1.35426