condition mean min max ZT0-3 0.9701992833333334 0.25569285 1.350165 ZT4-7 0.293609 0.293609 0.293609 ZT8-11 1.84873 1.84873 1.84873 ZT12-15 1.6622625 1.4224999999999999 1.902025 ZT16-19 1.80142 1.80142 1.80142 ZT20-23 1.74891 1.74891 1.74891