condition mean min max ZT0-3 22.18815 21.94145 22.434849999999997 ZT4-7 28.266399999999997 28.266399999999997 28.266399999999997 ZT8-11 36.5615 36.5615 36.5615 ZT12-15 0 0 0 ZT16-19 29.14495 29.14495 29.14495 ZT20-23 26.87125 26.87125 26.87125