condition mean min max ZT0-3 3.0579875 2.9941649999999997 3.12181 ZT4-7 3.33934 3.33934 3.33934 ZT8-11 7.553735 7.553735 7.553735 ZT12-15 0 0 0 ZT16-19 7.536995 7.536995 7.536995 ZT20-23 5.706765 5.706765 5.706765