condition mean min max ZT0-3 29.73605 29.73605 29.73605 ZT4-7 23.866100000000003 23.866100000000003 23.866100000000003 ZT8-11 32.237849999999995 32.237849999999995 32.237849999999995 ZT12-15 33.41 33.41 33.41 ZT16-19 44.8407 44.8407 44.8407 ZT20-23 31.17975 31.17975 31.17975