condition mean min max ZT0-3 63.274750000000004 63.274750000000004 63.274750000000004 ZT4-7 58.95475 58.95475 58.95475 ZT8-11 39.098749999999995 39.098749999999995 39.098749999999995 ZT12-15 41.792100000000005 41.792100000000005 41.792100000000005 ZT16-19 51.43345 51.43345 51.43345 ZT20-23 60.64805 60.64805 60.64805