condition mean min max ZT0-3 1.016588 0.6806030000000001 1.4827249999999998 ZT4-7 0.85112 0.85112 0.85112 ZT8-11 1.520556 1.520556 1.520556 ZT12-15 1.58746 1.469195 1.705725 ZT16-19 0.5601625 0.5601625 0.5601625 ZT20-23 1.1951809999999998 1.1951809999999998 1.1951809999999998