condition mean min max ZT0-3 4.294575696 2.590586456 5.998564935999999 ZT4-7 9.27230103325 7.9449706465 10.599631420000001 ZT8-11 7.7642304200000005 7.432473159 8.095987681 ZT12-15 3.50573566975 2.570811741 4.4406595985 ZT16-19 1.7044583172499999 1.6770167155 1.731899919 ZT20-23 0.7404925105 0.5367781745 0.9442068465