condition mean min max ZT0-3 9.3083 9.3083 9.3083 ZT4-7 3.57798 3.57798 3.57798 ZT8-11 3.66803 3.66803 3.66803 ZT12-15 7.25415 7.25415 7.25415 ZT16-19 10.609549999999999 10.609549999999999 10.609549999999999 ZT20-23 11.928 11.928 11.928