condition mean min max ZT0-3 50.36555 50.36555 50.36555 ZT4-7 38.682 38.682 38.682 ZT8-11 32.902550000000005 32.902550000000005 32.902550000000005 ZT12-15 44.087050000000005 44.087050000000005 44.087050000000005 ZT16-19 42.3075 42.3075 42.3075 ZT20-23 49.6186 49.6186 49.6186