condition mean min max ZT0-3 7.1019025 6.576465 7.62734 ZT4-7 4.01905 4.01905 4.01905 ZT8-11 1.6007799999999999 1.6007799999999999 1.6007799999999999 ZT12-15 0 0 0 ZT16-19 2.70467 2.70467 2.70467 ZT20-23 4.991255000000001 4.991255000000001 4.991255000000001