condition mean min max ZT0-3 5.49298 4.347225 7.644080000000001 ZT4-7 2.4842649999999997 2.4842649999999997 2.4842649999999997 ZT8-11 4.67917 4.67917 4.67917 ZT12-15 7.07115 6.76247 7.37983 ZT16-19 9.267759999999999 9.267759999999999 9.267759999999999 ZT20-23 9.714385 9.714385 9.714385