condition mean min max ZT0-3 1.5337125 1.51766 1.5497649999999998 ZT4-7 2.35482 2.35482 2.35482 ZT8-11 1.2139595 1.2139595 1.2139595 ZT12-15 0 0 0 ZT16-19 1.8001399999999999 1.8001399999999999 1.8001399999999999 ZT20-23 1.601485 1.601485 1.601485