condition mean min max ZT0-3 3.2416875 2.98318 3.5001949999999997 ZT4-7 3.90797 3.90797 3.90797 ZT8-11 5.366505 5.366505 5.366505 ZT12-15 0 0 0 ZT16-19 4.63434 4.63434 4.63434 ZT20-23 4.612275 4.612275 4.612275