condition mean min max ZT0-3 27.9086 27.9086 27.9086 ZT4-7 24.36665 24.36665 24.36665 ZT8-11 21.154600000000002 21.154600000000002 21.154600000000002 ZT12-15 24.2464 24.2464 24.2464 ZT16-19 31.618750000000002 31.618750000000002 31.618750000000002 ZT20-23 28.58515 28.58515 28.58515