condition mean min max ZT0-3 41.75 41.75 41.75 ZT4-7 74.7 74.7 74.7 ZT8-11 92.35 92.35 92.35 ZT12-15 56.400000000000006 56.400000000000006 56.400000000000006 ZT16-19 74.94999999999999 74.94999999999999 74.94999999999999 ZT20-23 33.300000000000004 33.300000000000004 33.300000000000004