condition mean min max ZT0-3 3.7850375 2.7775600000000003 4.792515 ZT4-7 1.0298715 1.0298715 1.0298715 ZT8-11 1.115801 1.115801 1.115801 ZT12-15 0 0 0 ZT16-19 3.0479149999999997 3.0479149999999997 3.0479149999999997 ZT20-23 2.694215 2.694215 2.694215