condition mean min max ZT0-3 0.68706077425 0.5046665515 0.8694549970000001 ZT4-7 0.40529864925000003 0.0667875605 0.743809738 ZT8-11 2.9073372057499998 2.01409927 3.8005751414999995 ZT12-15 5.687875932 4.409065533 6.966686331 ZT16-19 2.437788538 2.0992769845 2.7763000915 ZT20-23 1.69210422 1.5714649925000002 1.8127434475