condition mean min max ZT0-3 10.144058333333334 2.81703 15.83125 ZT4-7 25.04935 25.04935 25.04935 ZT8-11 179.5265 179.5265 179.5265 ZT12-15 131.338625 111.83875 150.8385 ZT16-19 104.642 104.642 104.642 ZT20-23 46.09505 46.09505 46.09505