condition mean min max ZT0-3 4.5291602275 3.526679273 5.5316411819999995 ZT4-7 10.02857458125 8.3087836675 11.748365495 ZT8-11 12.867569034999999 11.759718385 13.975419684999999 ZT12-15 8.689545365499999 7.9585738825 9.4205168485 ZT16-19 9.1364384205 7.2402283045 11.0326485365 ZT20-23 14.359306620000002 12.959023510000002 15.75958973