condition mean min max ZT0-3 2.6942399999999997 2.6942399999999997 2.6942399999999997 ZT4-7 2.0094849999999997 2.0094849999999997 2.0094849999999997 ZT8-11 3.06331 3.06331 3.06331 ZT12-15 3.256845 3.256845 3.256845 ZT16-19 4.72035 4.72035 4.72035 ZT20-23 3.522455 3.522455 3.522455