condition mean min max ZT0-3 21.785899999999998 21.785899999999998 21.785899999999998 ZT4-7 27.9842 27.9842 27.9842 ZT8-11 18.23755 18.23755 18.23755 ZT12-15 14.7365 14.7365 14.7365 ZT16-19 15.864450000000001 15.864450000000001 15.864450000000001 ZT20-23 16.79985 16.79985 16.79985