condition mean min max ZT0-3 5.101570000000001 5.101570000000001 5.101570000000001 ZT4-7 3.624285 3.624285 3.624285 ZT8-11 3.06994 3.06994 3.06994 ZT12-15 4.02034 4.02034 4.02034 ZT16-19 5.826420000000001 5.826420000000001 5.826420000000001 ZT20-23 4.269245 4.269245 4.269245