condition mean min max ZT0-3 0.7472946666666667 0.504169 1.080725 ZT4-7 0.3701505 0.3701505 0.3701505 ZT8-11 0.2752565 0.2752565 0.2752565 ZT12-15 0.49808099999999994 0.40871599999999997 0.5874459999999999 ZT16-19 0.3156365 0.3156365 0.3156365 ZT20-23 0.7056 0.7056 0.7056