condition mean min max ZT0-3 11.845568122666666 10.308595475333332 13.38254077 ZT4-7 14.161844655 13.44054319 14.88314612 ZT8-11 10.5429466015 9.876404658 11.209488545000001 ZT12-15 11.5989193445 10.95571865 12.242120039 ZT16-19 11.023108157500001 10.708093983666668 11.338122331333334 ZT20-23 12.2320705785 11.181525760333333 13.282615396666666