condition mean min max ZT0-3 6.092815 6.092815 6.092815 ZT4-7 4.552375 4.552375 4.552375 ZT8-11 5.692015 5.692015 5.692015 ZT12-15 5.583295 5.583295 5.583295 ZT16-19 6.932995 6.932995 6.932995 ZT20-23 5.208080000000001 5.208080000000001 5.208080000000001