condition mean min max ZT0-3 1.722445 1.722445 1.722445 ZT4-7 0.9852965 0.9852965 0.9852965 ZT8-11 1.582935 1.582935 1.582935 ZT12-15 3.288285 3.288285 3.288285 ZT16-19 2.6385449999999997 2.6385449999999997 2.6385449999999997 ZT20-23 1.86948 1.86948 1.86948