condition mean min max ZT0-3 1.7097825 1.26565 2.153915 ZT4-7 2.19916 2.19916 2.19916 ZT8-11 2.167662 2.167662 2.167662 ZT12-15 0 0 0 ZT16-19 2.373815 2.373815 2.373815 ZT20-23 1.819275 1.819275 1.819275