condition mean min max ZT0-3 439.843843 439.843843 439.843843 ZT4-7 296.0021315 296.0021315 296.0021315 ZT8-11 347.617094 347.617094 347.617094 ZT12-15 364.52191400000004 364.52191400000004 364.52191400000004 ZT16-19 518.2009935 518.2009935 518.2009935 ZT20-23 599.2239079999999 599.2239079999999 599.2239079999999