condition mean min max ZT0-3 0.6288400000000001 0.6288400000000001 0.6288400000000001 ZT4-7 0.364617 0.364617 0.364617 ZT8-11 0.818285 0.818285 0.818285 ZT12-15 0.39116466666666666 0.39116466666666666 0.39116466666666666 ZT16-19 0.7509990000000001 0.7509990000000001 0.7509990000000001 ZT20-23 0.648089 0.648089 0.648089