condition mean min max ZT0-3 2.875385 2.874775 2.875995 ZT4-7 2.3572800000000003 2.3572800000000003 2.3572800000000003 ZT8-11 2.268835 2.268835 2.268835 ZT12-15 0 0 0 ZT16-19 3.490805 3.490805 3.490805 ZT20-23 3.2955949999999996 3.2955949999999996 3.2955949999999996