condition mean min max ZT0-3 4.451025 4.451025 4.451025 ZT4-7 2.037075 2.037075 2.037075 ZT8-11 5.67427 5.67427 5.67427 ZT12-15 12.876149999999999 12.876149999999999 12.876149999999999 ZT16-19 10.32996 10.32996 10.32996 ZT20-23 5.937745 5.937745 5.937745