condition mean min max ZT0-3 0.130049 0.0730795 0.1870185 ZT4-7 0.07498969999999999 0.07498969999999999 0.07498969999999999 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0734705 0.0734705 0.0734705 ZT20-23 0.0371485 0.0371485 0.0371485