condition mean min max ZT0-3 0.050536899999999996 0.0331486 0.06792519999999999 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.03332585 0.03332585 0.03332585 ZT20-23 0.06711985000000001 0.06711985000000001 0.06711985000000001