condition mean min max ZT0-3 0.9964471666666668 0.677744 1.2154725000000002 ZT4-7 0.9031895 0.9031895 0.9031895 ZT8-11 1.869705 1.869705 1.869705 ZT12-15 3.46528 3.185135 3.745425 ZT16-19 3.55366 3.55366 3.55366 ZT20-23 1.86381 1.86381 1.86381