condition mean min max ZT0-3 14.044939999999999 5.91902 19.02115 ZT4-7 8.769404999999999 8.769404999999999 8.769404999999999 ZT8-11 25.55915 25.55915 25.55915 ZT12-15 18.06661 8.58137 27.55185 ZT16-19 29.920700000000004 29.920700000000004 29.920700000000004 ZT20-23 29.650599999999997 29.650599999999997 29.650599999999997