condition mean min max ZT0-3 11.647006666666666 8.286095 17.86645 ZT4-7 14.9028 14.9028 14.9028 ZT8-11 23.936700000000002 23.936700000000002 23.936700000000002 ZT12-15 24.291449999999998 19.319699999999997 29.263199999999998 ZT16-19 12.0648 12.0648 12.0648 ZT20-23 9.069514999999999 9.069514999999999 9.069514999999999