condition mean min max ZT0-3 10.089615 9.12993 11.0493 ZT4-7 4.057565 4.057565 4.057565 ZT8-11 3.576125 3.576125 3.576125 ZT12-15 0 0 0 ZT16-19 7.244995 7.244995 7.244995 ZT20-23 9.61416 9.61416 9.61416