condition mean min max ZT0-3 5.7591 5.00479 6.51341 ZT4-7 4.76035 4.76035 4.76035 ZT8-11 4.058595 4.058595 4.058595 ZT12-15 0 0 0 ZT16-19 5.014715 5.014715 5.014715 ZT20-23 5.972555 5.972555 5.972555