condition mean min max ZT0-3 1.63617410175 1.0459154605 2.226432743 ZT4-7 0.92297720275 0.2363270805 1.609627325 ZT8-11 1.76994139125 1.3049009744999998 2.234981808 ZT12-15 5.27233028675 4.6302460155 5.914414558000001 ZT16-19 8.3675588365 6.049956038 10.685161635 ZT20-23 19.063836645000002 15.60641798 22.52125531