condition mean min max ZT0-3 26.06065 23.87715 28.244149999999998 ZT4-7 15.6477 15.6477 15.6477 ZT8-11 15.311399999999999 15.311399999999999 15.311399999999999 ZT12-15 0 0 0 ZT16-19 29.585 29.585 29.585 ZT20-23 32.94825 32.94825 32.94825