condition mean min max ZT0-3 2189.081293 2189.081293 2189.081293 ZT4-7 2178.8956795 2178.8956795 2178.8956795 ZT8-11 1981.6503255 1981.6503255 1981.6503255 ZT12-15 2428.6030785000003 2428.6030785000003 2428.6030785000003 ZT16-19 2208.6069505 2208.6069505 2208.6069505 ZT20-23 3012.6848575000004 3012.6848575000004 3012.6848575000004