condition mean min max ZT0-3 0.21456855 0.1965231 0.232614 ZT4-7 0.350862 0.350862 0.350862 ZT8-11 0.1586885 0.1586885 0.1586885 ZT12-15 0 0 0 ZT16-19 0.579121 0.579121 0.579121 ZT20-23 0.23323300000000002 0.23323300000000002 0.23323300000000002