condition mean min max ZT0-3 1.2907403333333334 0.320926 1.86232 ZT4-7 1.0041734999999998 1.0041734999999998 1.0041734999999998 ZT8-11 1.1143785 1.1143785 1.1143785 ZT12-15 1.0445305 0.831046 1.2580149999999999 ZT16-19 1.66616 1.66616 1.66616 ZT20-23 2.001285 2.001285 2.001285