condition mean min max ZT0-3 41.80446666666667 30.29735 48.52805 ZT4-7 21.54035 21.54035 21.54035 ZT8-11 18.9555 18.9555 18.9555 ZT12-15 34.149 33.719899999999996 34.5781 ZT16-19 30.94305 30.94305 30.94305 ZT20-23 45.30945 45.30945 45.30945