condition mean min max ZT0-3 486.38409 486.38409 486.38409 ZT4-7 381.9624125 381.9624125 381.9624125 ZT8-11 277.22460049999995 277.22460049999995 277.22460049999995 ZT12-15 361.13390400000003 361.13390400000003 361.13390400000003 ZT16-19 308.743867 308.743867 308.743867 ZT20-23 279.4536975 279.4536975 279.4536975