condition mean min max ZT0-3 0.9803806666666667 0.346542 1.67517 ZT4-7 0.6035755 0.6035755 0.6035755 ZT8-11 1.371775 1.371775 1.371775 ZT12-15 1.41983975 1.0880495 1.75163 ZT16-19 1.472545 1.472545 1.472545 ZT20-23 1.538495 1.538495 1.538495