condition mean min max ZT0-3 0.39228522975 0.3500559585 0.434514501 ZT4-7 0.97301202125 0.6118507825 1.33417326 ZT8-11 2.103727123 1.9071683495 2.3002858965 ZT12-15 3.16087215775 2.352672788 3.9690715274999997 ZT16-19 2.01650364075 1.8378524914999999 2.19515479 ZT20-23 3.70961668925 3.4212403040000003 3.9979930745