condition mean min max ZT0-3 1.1739549999999999 1.1739549999999999 1.1739549999999999 ZT4-7 0.747916 0.747916 0.747916 ZT8-11 0.8169069999999999 0.8169069999999999 0.8169069999999999 ZT12-15 0.676247 0.676247 0.676247 ZT16-19 1.3812 1.3812 1.3812 ZT20-23 0.6899406666666666 0.6899406666666666 0.6899406666666666