condition mean min max ZT0-3 16.023148333333335 4.57909 35.49425 ZT4-7 92.95695 92.95695 92.95695 ZT8-11 20.19245 20.19245 20.19245 ZT12-15 22.20785 16.3871 28.028599999999997 ZT16-19 10.660409999999999 10.660409999999999 10.660409999999999 ZT20-23 7.05035 7.05035 7.05035