condition mean min max ZT0-3 9.668634999999998 9.668634999999998 9.668634999999998 ZT4-7 6.74582 6.74582 6.74582 ZT8-11 10.67635 10.67635 10.67635 ZT12-15 11.32115 11.32115 11.32115 ZT16-19 18.58015 18.58015 18.58015 ZT20-23 10.9101 10.9101 10.9101