condition mean min max ZT0-3 227.8275 198.4475 257.2075 ZT4-7 184.7535 184.7535 184.7535 ZT8-11 199.41449999999998 199.41449999999998 199.41449999999998 ZT12-15 0 0 0 ZT16-19 222.631 222.631 222.631 ZT20-23 215.82049999999998 215.82049999999998 215.82049999999998