condition mean min max ZT0-3 12.54005 12.54005 12.54005 ZT4-7 9.268545 9.268545 9.268545 ZT8-11 11.2747 11.2747 11.2747 ZT12-15 15.158850000000001 15.158850000000001 15.158850000000001 ZT16-19 20.64425 20.64425 20.64425 ZT20-23 14.57735 14.57735 14.57735