condition mean min max ZT0-3 0.2631825 0.2631825 0.2631825 ZT4-7 0.667125 0.667125 0.667125 ZT8-11 1.179688 1.179688 1.179688 ZT12-15 1.2103765 1.2103765 1.2103765 ZT16-19 1.1626395 1.1626395 1.1626395 ZT20-23 0.28771 0.28771 0.28771