condition mean min max ZT0-3 6.1869325 5.94716 6.426705 ZT4-7 4.51744 4.51744 4.51744 ZT8-11 4.443405 4.443405 4.443405 ZT12-15 0 0 0 ZT16-19 8.803915 8.803915 8.803915 ZT20-23 6.5144649999999995 6.5144649999999995 6.5144649999999995