condition mean min max ZT0-3 10.991434901 6.190222327000001 15.792647474999999 ZT4-7 26.6988682 26.18464007 27.21309633 ZT8-11 22.984755445 20.79599117 25.17351972 ZT12-15 22.742285550000002 22.36242877 23.122142330000003 ZT16-19 31.227499225000003 27.094358675000002 35.360639775 ZT20-23 63.85513456 49.673655995000004 78.036613125