condition mean min max ZT0-3 5.2084225 5.19572 5.221125000000001 ZT4-7 3.928725 3.928725 3.928725 ZT8-11 2.28503 2.28503 2.28503 ZT12-15 0 0 0 ZT16-19 4.637785 4.637785 4.637785 ZT20-23 5.2189 5.2189 5.2189