condition mean min max ZT0-3 9.30127 9.30127 9.30127 ZT4-7 8.896425 8.896425 8.896425 ZT8-11 5.83827 5.83827 5.83827 ZT12-15 6.228680000000001 6.228680000000001 6.228680000000001 ZT16-19 8.603110000000001 8.603110000000001 8.603110000000001 ZT20-23 12.95895 12.95895 12.95895