condition mean min max ZT0-3 0.6832401666666668 0.0989345 1.2368000000000001 ZT4-7 0.501735 0.501735 0.501735 ZT8-11 0.6107899999999999 0.6107899999999999 0.6107899999999999 ZT12-15 1.3930725000000002 1.1723350000000001 1.61381 ZT16-19 1.0548915 1.0548915 1.0548915 ZT20-23 0.7656905 0.7656905 0.7656905