condition mean min max ZT0-3 1399.385903 1399.385903 1399.385903 ZT4-7 1594.115623 1594.115623 1594.115623 ZT8-11 1511.851377 1511.851377 1511.851377 ZT12-15 1389.8606325 1389.8606325 1389.8606325 ZT16-19 1513.1159895 1513.1159895 1513.1159895 ZT20-23 1698.301819 1698.301819 1698.301819