condition mean min max ZT0-3 7.3457875 7.080825 7.6107499999999995 ZT4-7 5.95473 5.95473 5.95473 ZT8-11 9.1894 9.1894 9.1894 ZT12-15 0 0 0 ZT16-19 10.8535 10.8535 10.8535 ZT20-23 8.62786 8.62786 8.62786