condition mean min max ZT0-3 2.0515999999999996 1.759585 2.343615 ZT4-7 1.55813 1.55813 1.55813 ZT8-11 2.33859 2.33859 2.33859 ZT12-15 0 0 0 ZT16-19 3.1020399999999997 3.1020399999999997 3.1020399999999997 ZT20-23 2.505625 2.505625 2.505625