condition mean min max ZT0-3 3.448291666666667 3.4210000000000003 3.473715 ZT4-7 2.33169 2.33169 2.33169 ZT8-11 3.869155 3.869155 3.869155 ZT12-15 4.613977500000001 3.8549350000000002 5.37302 ZT16-19 4.34007 4.34007 4.34007 ZT20-23 4.05632 4.05632 4.05632