condition mean min max ZT0-3 1.8447413333333331 0.9738039999999999 2.4530849999999997 ZT4-7 1.178405 1.178405 1.178405 ZT8-11 2.782375 2.782375 2.782375 ZT12-15 4.4107175 3.911045 4.91039 ZT16-19 3.649985 3.649985 3.649985 ZT20-23 4.868805 4.868805 4.868805