condition mean min max ZT0-3 3.055938333333333 2.108495 4.036715 ZT4-7 3.04056 3.04056 3.04056 ZT8-11 4.710235 4.710235 4.710235 ZT12-15 12.94596 12.30807 13.58385 ZT16-19 7.97968 7.97968 7.97968 ZT20-23 3.3651999999999997 3.3651999999999997 3.3651999999999997