condition mean min max ZT0-3 4.59511 4.1542449999999995 5.0359750000000005 ZT4-7 5.7900849999999995 5.7900849999999995 5.7900849999999995 ZT8-11 8.55945 8.55945 8.55945 ZT12-15 0 0 0 ZT16-19 7.715005 7.715005 7.715005 ZT20-23 5.70042 5.70042 5.70042