condition mean min max ZT0-3 4.8288975 1.894345 7.76345 ZT4-7 1.91188 1.91188 1.91188 ZT8-11 7.7293199999999995 7.7293199999999995 7.7293199999999995 ZT12-15 0 0 0 ZT16-19 5.736 5.736 5.736 ZT20-23 9.581195000000001 9.581195000000001 9.581195000000001