condition mean min max ZT0-3 14.483323630000001 13.21004318 15.75660408 ZT4-7 7.61744951 7.1903180115 8.0445810085 ZT8-11 6.476255310749999 5.950005173499999 7.002505447999999 ZT12-15 6.55081168725 6.533537897 6.5680854775 ZT16-19 7.123817355 6.1746138475 8.0730208625 ZT20-23 11.05577045125 9.4323751075 12.679165795