condition mean min max ZT0-3 64.65 64.65 64.65 ZT4-7 49.9 49.9 49.9 ZT8-11 84.05 84.05 84.05 ZT12-15 50.95 50.95 50.95 ZT16-19 36.650000000000006 36.650000000000006 36.650000000000006 ZT20-23 66.35 66.35 66.35