condition mean min max ZT0-3 5.7079425 5.44512 5.970765 ZT4-7 6.405685 6.405685 6.405685 ZT8-11 5.911685 5.911685 5.911685 ZT12-15 0 0 0 ZT16-19 6.70083 6.70083 6.70083 ZT20-23 6.96704 6.96704 6.96704