condition mean min max ZT0-3 45.6122 43.13865 48.08575 ZT4-7 32.55805 32.55805 32.55805 ZT8-11 28.807299999999998 28.807299999999998 28.807299999999998 ZT12-15 0 0 0 ZT16-19 56.1208 56.1208 56.1208 ZT20-23 60.713849999999994 60.713849999999994 60.713849999999994