condition mean min max ZT0-3 351.995555 351.995555 351.995555 ZT4-7 417.30010649999997 417.30010649999997 417.30010649999997 ZT8-11 361.609697 361.609697 361.609697 ZT12-15 357.21806200000003 357.21806200000003 357.21806200000003 ZT16-19 354.40020749999996 354.40020749999996 354.40020749999996 ZT20-23 287.4875125 287.4875125 287.4875125