condition mean min max ZT0-3 0.56510825 0.5603435 0.5698730000000001 ZT4-7 0.4449615 0.4449615 0.4449615 ZT8-11 0.2861715 0.2861715 0.2861715 ZT12-15 0 0 0 ZT16-19 0.43553850000000005 0.43553850000000005 0.43553850000000005 ZT20-23 0.406564 0.406564 0.406564