condition mean min max ZT0-3 3.65832 3.07023 4.24641 ZT4-7 1.6188250000000002 1.6188250000000002 1.6188250000000002 ZT8-11 5.012535 5.012535 5.012535 ZT12-15 0 0 0 ZT16-19 6.997655 6.997655 6.997655 ZT20-23 1.945325 1.945325 1.945325