condition mean min max ZT0-3 1.0477628967500001 0.613202487 1.4823233065 ZT4-7 3.83077184325 2.689312802 4.9722308845 ZT8-11 7.439180228 6.1999110385 8.6784494175 ZT12-15 9.74586054725 9.6051095435 9.886611551 ZT16-19 10.49232683775 9.8936991395 11.090954536 ZT20-23 12.984214439999999 12.980311315 12.988117565