condition mean min max ZT0-3 9.689083166916665 7.338085338333333 12.040080995499999 ZT4-7 7.9861327258333334 7.862023377333333 8.110242074333334 ZT8-11 10.029836719999999 9.042871058 11.016802382 ZT12-15 11.950119503 11.516443786 12.38379522 ZT16-19 10.782167839500001 9.627756980000001 11.936578699 ZT20-23 12.981959303333333 11.89042339 14.073495216666666