condition mean min max ZT0-3 3.155828 1.71181 4.599846 ZT4-7 2.5693799999999998 2.5693799999999998 2.5693799999999998 ZT8-11 7.29479 7.29479 7.29479 ZT12-15 0 0 0 ZT16-19 5.04958 5.04958 5.04958 ZT20-23 2.1178285 2.1178285 2.1178285