condition mean min max ZT0-3 1018.1999999999999 1018.1999999999999 1018.1999999999999 ZT4-7 913.2 913.2 913.2 ZT8-11 579.55 579.55 579.55 ZT12-15 497.45000000000005 497.45000000000005 497.45000000000005 ZT16-19 433.55 433.55 433.55 ZT20-23 688.3 688.3 688.3