condition mean min max ZT0-3 3.0995074999999996 2.4786599999999996 3.720355 ZT4-7 2.9900599999999997 2.9900599999999997 2.9900599999999997 ZT8-11 3.129 3.129 3.129 ZT12-15 0 0 0 ZT16-19 3.735995 3.735995 3.735995 ZT20-23 3.588075 3.588075 3.588075