condition mean min max ZT0-3 0.4996965 0.4996965 0.4996965 ZT4-7 0.29589 0.29589 0.29589 ZT8-11 0.3817915 0.3817915 0.3817915 ZT12-15 0.4529035 0.4529035 0.4529035 ZT16-19 0.9100900000000001 0.9100900000000001 0.9100900000000001 ZT20-23 0.565016 0.565016 0.565016