condition mean min max ZT0-3 1842.881599 1842.881599 1842.881599 ZT4-7 2173.285918 2173.285918 2173.285918 ZT8-11 2276.8989979999997 2276.8989979999997 2276.8989979999997 ZT12-15 2101.452642 2101.452642 2101.452642 ZT16-19 1873.184633 1873.184633 1873.184633 ZT20-23 1893.756318 1893.756318 1893.756318