condition mean min max ZT0-3 2.915355 2.328605 3.5021050000000002 ZT4-7 1.8278699999999999 1.8278699999999999 1.8278699999999999 ZT8-11 1.303835 1.303835 1.303835 ZT12-15 0 0 0 ZT16-19 3.3812299999999995 3.3812299999999995 3.3812299999999995 ZT20-23 2.894855 2.894855 2.894855