condition mean min max ZT0-3 6.15269171175 2.703008132 9.6023752915 ZT4-7 45.3825470425 34.700634305 56.06445978 ZT8-11 139.49547091 94.95749187 184.03344995 ZT12-15 400.77040157500005 386.57927545 414.96152770000003 ZT16-19 314.53136845 276.89311715 352.16961975 ZT20-23 198.02360657499997 192.81344194999997 203.23377119999998