condition mean min max ZT0-3 68.42345 68.42345 68.42345 ZT4-7 63.4147 63.4147 63.4147 ZT8-11 41.691199999999995 41.691199999999995 41.691199999999995 ZT12-15 48.36945 48.36945 48.36945 ZT16-19 56.858549999999994 56.858549999999994 56.858549999999994 ZT20-23 59.9371 59.9371 59.9371