condition mean min max ZT0-3 26.570574999999998 25.4937 27.64745 ZT4-7 25.311149999999998 25.311149999999998 25.311149999999998 ZT8-11 27.97005 27.97005 27.97005 ZT12-15 0 0 0 ZT16-19 30.674999999999997 30.674999999999997 30.674999999999997 ZT20-23 24.7509 24.7509 24.7509