condition mean min max ZT0-3 1.0199981666666667 0.704258 1.27236 ZT4-7 1.34773 1.34773 1.34773 ZT8-11 1.158132 1.158132 1.158132 ZT12-15 3.524625 2.71863 4.33062 ZT16-19 2.1085149999999997 2.1085149999999997 2.1085149999999997 ZT20-23 0.7938985000000001 0.7938985000000001 0.7938985000000001