condition mean min max ZT0-3 17.0197 16.017850000000003 18.021549999999998 ZT4-7 20.634 20.634 20.634 ZT8-11 18.503999999999998 18.503999999999998 18.503999999999998 ZT12-15 0 0 0 ZT16-19 15.8575 15.8575 15.8575 ZT20-23 18.85675 18.85675 18.85675