condition mean min max ZT0-3 0.3237985 0.25004550000000003 0.3975515 ZT4-7 0.290742 0.290742 0.290742 ZT8-11 0.218457 0.218457 0.218457 ZT12-15 0 0 0 ZT16-19 0.603531 0.603531 0.603531 ZT20-23 0.427917 0.427917 0.427917