condition mean min max ZT0-3 0.0738526 0.0738526 0.0738526 ZT4-7 0.018333 0.018333 0.018333 ZT8-11 0.03007255 0.03007255 0.03007255 ZT12-15 0.0304076 0.0304076 0.0304076 ZT16-19 0.0 0.0 0.0 ZT20-23 0.08745164999999999 0.08745164999999999 0.08745164999999999