condition mean min max ZT0-3 3.3021149999999997 3.187885 3.4163449999999997 ZT4-7 4.14393 4.14393 4.14393 ZT8-11 5.2166049999999995 5.2166049999999995 5.2166049999999995 ZT12-15 0 0 0 ZT16-19 4.58953 4.58953 4.58953 ZT20-23 4.41774 4.41774 4.41774