condition mean min max ZT0-3 10.266796073166667 10.202590535333334 10.331001611000001 ZT4-7 7.2352298600000005 5.635957247 8.834502473 ZT8-11 7.953087450666667 7.575864421666666 8.330310479666666 ZT12-15 7.6744282945 6.533482794 8.815373795000001 ZT16-19 12.534398695833334 11.416997045 13.651800346666667 ZT20-23 11.472560891833332 10.410788817 12.534332966666666