condition mean min max ZT0-3 1360.922777 1360.922777 1360.922777 ZT4-7 900.122361 900.122361 900.122361 ZT8-11 1912.0012875 1912.0012875 1912.0012875 ZT12-15 1639.1026545 1639.1026545 1639.1026545 ZT16-19 3492.480582 3492.480582 3492.480582 ZT20-23 2036.4296165 2036.4296165 2036.4296165