condition mean min max ZT0-3 1.8304375000000002 1.5906150000000001 2.07026 ZT4-7 0.5883085 0.5883085 0.5883085 ZT8-11 1.057973 1.057973 1.057973 ZT12-15 0 0 0 ZT16-19 1.95997 1.95997 1.95997 ZT20-23 0.8892875 0.8892875 0.8892875