condition mean min max ZT0-3 0.065476575 0.03484815 0.096105 ZT4-7 0.346599 0.346599 0.346599 ZT8-11 0.4144953 0.4144953 0.4144953 ZT12-15 0 0 0 ZT16-19 0.29169849999999997 0.29169849999999997 0.29169849999999997 ZT20-23 0.47569950000000005 0.47569950000000005 0.47569950000000005