condition mean min max ZT0-3 1.222365 0.60732 2.29942 ZT4-7 1.012025 1.012025 1.012025 ZT8-11 1.689771 1.689771 1.689771 ZT12-15 0.7052575 0.0 1.410515 ZT16-19 1.16441 1.16441 1.16441 ZT20-23 2.661725 2.661725 2.661725