condition mean min max ZT0-3 7.658 5.69852 9.61748 ZT4-7 4.39152 4.39152 4.39152 ZT8-11 8.376395 8.376395 8.376395 ZT12-15 0 0 0 ZT16-19 10.119895 10.119895 10.119895 ZT20-23 9.953835 9.953835 9.953835