condition mean min max ZT0-3 0.25360699999999997 0.08233 0.346369 ZT4-7 0.1512065 0.1512065 0.1512065 ZT8-11 0.318309 0.318309 0.318309 ZT12-15 0.32777775 0.324546 0.3310095 ZT16-19 0.153868 0.153868 0.153868 ZT20-23 0.5081405 0.5081405 0.5081405