condition mean min max ZT0-3 25.828899999999997 25.828899999999997 25.828899999999997 ZT4-7 18.3039 18.3039 18.3039 ZT8-11 20.742449999999998 20.742449999999998 20.742449999999998 ZT12-15 30.701 30.701 30.701 ZT16-19 39.216049999999996 39.216049999999996 39.216049999999996 ZT20-23 36.38615 36.38615 36.38615