condition mean min max ZT0-3 3.1129475 2.517875 3.7080200000000003 ZT4-7 18.8731 18.8731 18.8731 ZT8-11 26.9707 26.9707 26.9707 ZT12-15 0 0 0 ZT16-19 18.639899999999997 18.639899999999997 18.639899999999997 ZT20-23 10.611650000000001 10.611650000000001 10.611650000000001