condition mean min max ZT0-3 2.1735775 1.732245 2.61491 ZT4-7 1.15184 1.15184 1.15184 ZT8-11 0.9886159999999999 0.9886159999999999 0.9886159999999999 ZT12-15 0 0 0 ZT16-19 1.279439 1.279439 1.279439 ZT20-23 0.9467715 0.9467715 0.9467715