condition mean min max ZT0-3 1286.841779 1286.841779 1286.841779 ZT4-7 2047.284143 2047.284143 2047.284143 ZT8-11 1880.1808369999999 1880.1808369999999 1880.1808369999999 ZT12-15 1975.555976 1975.555976 1975.555976 ZT16-19 1388.6132404999998 1388.6132404999998 1388.6132404999998 ZT20-23 1581.013447 1581.013447 1581.013447