condition mean min max ZT0-3 18.163349999999998 14.51835 21.808349999999997 ZT4-7 19.92475 19.92475 19.92475 ZT8-11 8.02971 8.02971 8.02971 ZT12-15 0 0 0 ZT16-19 12.42525 12.42525 12.42525 ZT20-23 17.06945 17.06945 17.06945