condition mean min max ZT0-3 7.1800999999999995 6.465059999999999 7.89514 ZT4-7 3.84264 3.84264 3.84264 ZT8-11 3.991575 3.991575 3.991575 ZT12-15 0 0 0 ZT16-19 5.38686 5.38686 5.38686 ZT20-23 6.677605 6.677605 6.677605