condition mean min max ZT0-3 2.3715450000000002 2.010215 3.00678 ZT4-7 1.65701 1.65701 1.65701 ZT8-11 1.573 1.573 1.573 ZT12-15 2.3041175 2.0822849999999997 2.52595 ZT16-19 1.879135 1.879135 1.879135 ZT20-23 2.9050149999999997 2.9050149999999997 2.9050149999999997