condition mean min max ZT0-3 0.0321748 0.0321748 0.0321748 ZT4-7 0.1332995 0.1332995 0.1332995 ZT8-11 0.0242953 0.0242953 0.0242953 ZT12-15 0.0 0.0 0.0 ZT16-19 0.058653800000000006 0.058653800000000006 0.058653800000000006 ZT20-23 0.09428985000000001 0.09428985000000001 0.09428985000000001