condition mean min max ZT0-3 0.72205765675 0.0 1.4441153135 ZT4-7 2.64337964825 1.9057352965 3.381024 ZT8-11 3.64256591525 2.8274632315000003 4.457668599 ZT12-15 4.50046842175 4.419533872 4.5814029715 ZT16-19 3.45899073125 3.1789187245 3.7390627380000003 ZT20-23 1.7761239005 1.1538826955 2.3983651055