condition mean min max ZT0-3 6.745425000000001 5.04306 8.447790000000001 ZT4-7 6.36093 6.36093 6.36093 ZT8-11 11.8712 11.8712 11.8712 ZT12-15 0 0 0 ZT16-19 5.997655 5.997655 5.997655 ZT20-23 4.4794 4.4794 4.4794