condition mean min max ZT0-3 2.488709 1.7963529999999999 3.181065 ZT4-7 3.2579199999999995 3.2579199999999995 3.2579199999999995 ZT8-11 1.77658 1.77658 1.77658 ZT12-15 0 0 0 ZT16-19 2.47185 2.47185 2.47185 ZT20-23 2.8386250000000004 2.8386250000000004 2.8386250000000004