condition mean min max ZT0-3 401.93577 401.93577 401.93577 ZT4-7 394.20429249999995 394.20429249999995 394.20429249999995 ZT8-11 412.5642675 412.5642675 412.5642675 ZT12-15 336.16963999999996 336.16963999999996 336.16963999999996 ZT16-19 483.6704055 483.6704055 483.6704055 ZT20-23 569.9293895 569.9293895 569.9293895