condition mean min max ZT0-3 1.5810236172499998 1.021457619 2.1405896154999997 ZT4-7 4.64703395825 2.8835449504999997 6.410522966 ZT8-11 7.27777016775 7.076909893 7.4786304425 ZT12-15 7.0150976675 6.9078481315 7.1223472035 ZT16-19 7.40547213475 6.3120916575 8.498852612 ZT20-23 13.764006030000001 11.236768395 16.291243665