condition mean min max ZT0-3 18.878509155 17.22439262 20.53262569 ZT4-7 20.125955185000002 19.561947605 20.689962765 ZT8-11 22.4229092275 21.352648639999998 23.493169815 ZT12-15 18.1202090275 17.406217695 18.83420036 ZT16-19 27.5720179325 22.29355623 32.850479635 ZT20-23 41.06132884 40.551606125 41.571051555