condition mean min max ZT0-3 3.5423 3.5423 3.5423 ZT4-7 3.3592199999999997 3.3592199999999997 3.3592199999999997 ZT8-11 2.682295 2.682295 2.682295 ZT12-15 1.457595 1.457595 1.457595 ZT16-19 2.49159 2.49159 2.49159 ZT20-23 3.157045 3.157045 3.157045