condition mean min max ZT0-3 1.6061175 1.25468 1.9575550000000002 ZT4-7 1.32097 1.32097 1.32097 ZT8-11 0.5832885 0.5832885 0.5832885 ZT12-15 0 0 0 ZT16-19 1.444245 1.444245 1.444245 ZT20-23 2.36694 2.36694 2.36694