condition mean min max ZT0-3 0.21620925000000002 0.2139895 0.218429 ZT4-7 0.341674 0.341674 0.341674 ZT8-11 0.5815095 0.5815095 0.5815095 ZT12-15 0 0 0 ZT16-19 0.9587460000000001 0.9587460000000001 0.9587460000000001 ZT20-23 0.3060005 0.3060005 0.3060005