condition mean min max ZT0-3 0.2791 0.2791 0.2791 ZT4-7 0.35102900000000004 0.35102900000000004 0.35102900000000004 ZT8-11 0.31253149999999996 0.31253149999999996 0.31253149999999996 ZT12-15 0.2613185 0.2613185 0.2613185 ZT16-19 0.4035646666666667 0.4035646666666667 0.4035646666666667 ZT20-23 0.37879599999999997 0.37879599999999997 0.37879599999999997