condition mean min max ZT0-3 403.30898 403.30898 403.30898 ZT4-7 157.5012875 157.5012875 157.5012875 ZT8-11 48.823094999999995 48.823094999999995 48.823094999999995 ZT12-15 54.939819 54.939819 54.939819 ZT16-19 34.966575500000005 34.966575500000005 34.966575500000005 ZT20-23 33.8688415 33.8688415 33.8688415