condition mean min max ZT0-3 27.39705 27.341450000000002 27.45265 ZT4-7 21.0424 21.0424 21.0424 ZT8-11 32.6948 32.6948 32.6948 ZT12-15 0 0 0 ZT16-19 38.730000000000004 38.730000000000004 38.730000000000004 ZT20-23 26.77275 26.77275 26.77275