condition mean min max ZT0-3 2.5710125 2.3004350000000002 2.84159 ZT4-7 2.30448 2.30448 2.30448 ZT8-11 2.5048399999999997 2.5048399999999997 2.5048399999999997 ZT12-15 0 0 0 ZT16-19 2.403915 2.403915 2.403915 ZT20-23 2.126565 2.126565 2.126565