condition mean min max ZT0-3 8.389032186000001 8.222395598 8.555668774 ZT4-7 11.912243905 10.739358545 13.085129264999999 ZT8-11 20.466312502500003 16.036713470000002 24.895911535 ZT12-15 26.6577303925 23.653455049999998 29.662005734999997 ZT16-19 19.57599587 18.864193614999998 20.287798125000002 ZT20-23 23.521865155 20.44279568 26.600934629999998