condition mean min max ZT0-3 1.55022 1.55022 1.55022 ZT4-7 0.9481495 0.9481495 0.9481495 ZT8-11 1.068744 1.068744 1.068744 ZT12-15 1.8595199999999998 1.8595199999999998 1.8595199999999998 ZT16-19 2.9489 2.9489 2.9489 ZT20-23 2.088895 2.088895 2.088895