condition mean min max ZT0-3 37.8782501175 33.061321945 42.69517829 ZT4-7 29.48177337 27.574727975000002 31.388818765 ZT8-11 28.588878405000003 26.09501235 31.08274446 ZT12-15 65.188077795 55.835872675000005 74.540282915 ZT16-19 86.5201075425 85.386044345 87.65417074000001 ZT20-23 90.71185618 87.119586005 94.304126355