condition mean min max ZT0-3 0.448252 0.448252 0.448252 ZT4-7 0.1942135 0.1942135 0.1942135 ZT8-11 0.47399100000000005 0.47399100000000005 0.47399100000000005 ZT12-15 1.0321280000000002 1.0321280000000002 1.0321280000000002 ZT16-19 1.1063833333333333 1.1063833333333333 1.1063833333333333 ZT20-23 0.290529 0.290529 0.290529