condition mean min max ZT0-3 12.733552 12.733552 12.733552 ZT4-7 21.847928500000002 21.847928500000002 21.847928500000002 ZT8-11 26.415985 26.415985 26.415985 ZT12-15 19.257298 19.257298 19.257298 ZT16-19 15.2687675 15.2687675 15.2687675 ZT20-23 14.661794 14.661794 14.661794