condition mean min max ZT0-3 7.7326075 7.13439 8.330825 ZT4-7 3.4778450000000003 3.4778450000000003 3.4778450000000003 ZT8-11 1.397825 1.397825 1.397825 ZT12-15 0 0 0 ZT16-19 3.833945 3.833945 3.833945 ZT20-23 5.300465 5.300465 5.300465