condition mean min max ZT0-3 6.1000725 5.870185 6.32996 ZT4-7 6.733924999999999 6.733924999999999 6.733924999999999 ZT8-11 27.434399999999997 27.434399999999997 27.434399999999997 ZT12-15 0 0 0 ZT16-19 19.9635 19.9635 19.9635 ZT20-23 11.23375 11.23375 11.23375